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Tytuł:
Factors influencing axial compressor stalls
Autorzy:
Laskowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/196204.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
stall
axial compressor
performance
stoisko
sprężarka osiowa
wydajność
Opis:
The article describes the problem regarding stalls in axial compressors, which are widely used in the engines of large and very large transportation aircrafts. The stall phenomenon, unless cleared, poses a major danger to the integrity of a compressor module, which in turn may result in uncontained engine failure and loss of thrust, thereby seriously affecting flight safety. The costs of maintenance to be performed may also be very high, due to irreversible deterioration in some components. A practical assessment of the stall problem and its countermeasures are discussed below.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2017, 95; 89-96
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical model of evaluation of the efficiency of investment into roads
Matematyczny model do wyznaczenia efektywości inwestycji drogowych
Autorzy:
Lingaitis, V.
Powiązania:
https://bibliotekanauki.pl/articles/374693.pdf
Data publikacji:
2008
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
investment
model matematyczny
wydajność
inwestycje
mathematical model
efficiency
Opis:
When implementing projects on motor roads, financial and economic analysis of specific projects are usually provided. This article deals with the mathematical model which enables to analyze the entirety of projects on the motor road network with the view of determining which of them would give benefit to society the fastest and could be given priority in case of implementation. By applying this model and using the LP search (abbreviation from Russian Linear search) multi-criteria optimizing method, it is possible to calculate the project payoff time and an expected profit through the reduction of public costs. Also, an example on realization of the model is provided with calculation of the benefit that society receives if gravel road is paved.
Źródło:
Transport Problems; 2008, 3, 3; 41-51
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the possibility of using the kamishibai audit in the area of quality inspection process implementation
Autorzy:
Knop, K.
Ulewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/393160.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
audit
quality inspection
standards
improvement
audyt
kontrola jakości
standardy
wydajność
Opis:
The article analyses the possibilities of using the kamishibai audit in the area of quality inspection process implementation. The kamishibai audit is a tool of lean and visual management concept used, among others, in the Toyota automotive company in order to verify their compliance with standards. This audit can, in effect, contribute to the improvement of processes. In the article, the kamishibai audit was characterised, the characteristics of the audit that determine its usefulness in the area of quality inspection processes were identified, and an example procedure for the implementation of the kamishibai audit in the examined area was presented. The article also presents the characteristics of the successful implementation of kamishibai audits and ways of enhancing their effectiveness. It has been proven that kamishibai audits can be successfully used to evaluate standards in the area of quality inspection processes.
Źródło:
Organizacja i Zarządzanie : kwartalnik naukowy; 2018, 3; 31-49
1899-6116
Pojawia się w:
Organizacja i Zarządzanie : kwartalnik naukowy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cost efficiency of administrative service in public higher education in Poland
Autorzy:
Brzezicki, Łukasz
Łącka, Irena
Powiązania:
https://bibliotekanauki.pl/articles/27313606.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
cost
efficiency
Malmquist
DEA
higher education
koszt
wydajność
szkolnictwo wyższe
Opis:
Purpose: The aim of the study is to determine changes in the cost efficiency of the administration of public higher education in Poland. Design/methodology/approach: The biennial cost Malmquist productivity index was used to study changes in cost efficiency of 58 public higher education institutions in 2014-2016. The results were presented for 6 groups of universities, according to the Ministry of Science and Higher Education in Poland classification. Findings: The research shows that out of 6 groups of institutions accepted for the study, 2 achieved an increase and 1 a decrease in the Malmquist cost index in both study periods. Changes in the Malmquist cost index in the analyzed period are small as the index ranged from 0.98 to 1.06. Both component overall efficiency change and cost-technical change contributed to the change in the Malmquist index level. Research limitations/implications: The main limitation of the study are the analysis of changes in cost efficiency only. Additionally, only public universities supervised by the ministry responsible for higher education were studied. Future research should include changes in allocative efficiency using the Malmquist index. In addition, a larger research sample should be considered, taking into account other public universities, including medical, arts, etc., and non-public universities. Practical implications: The considerations presented are relevant to public university authorities. The article indicates the need to assess cost effectiveness in evaluating the functioning of a higher education institution. This belongs to the responsibilities of management control in terms of effectiveness and efficiency of HEIs and spending of public funds. Information on the variation of cost efficiency between HEIs, assigned to 6 groups, may become a stimulus to conduct an assessment of this economic category in a given unit and strive to improve it. Originality/value: The added value of the article is the use for the first time of the cost Malmquist index to examine higher education. Also, the use of a modified version of the cost Malmquist index to estimate efficiency assuming variable returns-to-scale.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 156; 81--98
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the efficiency and effectiveness of the municipality-owned public bus transport service enterprise in Addis Ababa, Ethiopia
Autorzy:
Girma, Mulugeta
Powiązania:
https://bibliotekanauki.pl/articles/27314656.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
technical efficiency
operational effectiveness
municipality
wydajność techniczna
efektywność operacyjna
gmina
Opis:
To make decisions and exercise managerial control over the degree of input utilization, and produce desired outputs, it is important to assess the efficiency and effectiveness of the municipality-owned public transit service operators. This study uses the Data Envelopment Analysis approach to assess the efficiency and effectiveness of the public transit companies operated by the city administration in Addis Ababa. The size of the fleet and the total number of personnel serve as inputs, and covered vehicle kilometers and the number of passengers carried annually serve as outputs. Based on secondary information gathered from each firm, the technical efficiency and operational effectiveness of service providers are then examined. The study's findings show that the Anbessa city bus was efficient in using resources to produce output in 2019/20 and 2021/22, but wasteful in other years. In the same way, the Sheger City Bus was efficient in 2017/18 and 2021/22 but ineffective in all other years. However, the aggregate findings show that both research's efficiency levels are rising annually. Besides, with mean scores of 0.85 and 0.874, respectively, Anbessa and Sheger Bus were technically flawed. On the other side, operational effectiveness reveals that the Anbessa city bus was only effective in 2021/22. Furthermore, the Sheger city bus' effectiveness result has improved and started to be effective in 2017/18, 2018/19, and 2021/22. In conclusion, the Anbessa and Sheger city buses' efficiency and effectiveness ratings improved year over year and peaked in 2021/22. Hence, to support the business and boost its operational capabilities, the city administration should encourage public bus transit operators in the city and offer subsidies and other incentives to them based on their existing performance.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 120; 93--104
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effectiveness of working capital management strategies in manufacturing enterprises
Autorzy:
Kaczmarek, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/323529.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
working capital management
efficiency
strategies
zarządzanie kapitałem obrotowym
wydajność
strategie
Opis:
The paper presents the results of a study aimed at identifying and assessing the efficiency of working capital management strategies in enterprises. The analysis focuses on the volumes of net working capital and its cycle (dependent variable), as well as the conversion cycles of its main components (independent variables). The study comprises the entire population of manufacturing enterprises in Poland covered by public statistics (nearly 14 thousand entities), divided into size categories (small, medium and large). The long-term analysis covers the period of 2007-2018. The study makes use of the measures that characterise working capital management strategies and their effects including net working capital volumes and working capital cycles. The study also employs measures related to correlations, similarity, density, positioning and classifying, as well as descriptive statistics. The effect of the study is the verification of three research hypotheses related to the characteristics, correlations, profile similarities and identification of working capital strategies in manufacturing enterprises.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2019, 136; 191-208
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of organizational culture in the performance of chosen companies
Autorzy:
Kiełbasa, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/2032991.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
organizational culture
performance
management
ratio analysis
kultura organizacyjna
wydajność
zarządzanie
analiza wskaźnikowa
Opis:
Introduction/background: Organizational culture is a relatively new issue. This concept has started to take on a great importance in modern organizations based on knowledge and innovation. The researchers and managers were faced with the problem of how to introduce values into the organization, how to implement the company's mission and vision, how to “manage” employees' creativity, how to motivate and assign tasks to employees. Another important issue concerns measuring the impact of these soft factors on solid results. Is there a relationship between organizational culture and organizational performance and how to verify it? Aim of the paper: The work deals with the topic of organizational culture in theoretical and practical terms. The aim of the work was to define the influence of organizational culture on the management performance. Materials and methods: The work is based on literature studies, the results of literary studies from empirical research and own research of the author. Index methods were used to assess the condition of enterprises based on publicly available financial statements. The research supplements the opinions of employees of these companies. Results and conclusions: In the surveyed organizations, values, relationships and cooperation are put in the first place. Employees work primarily in teams. The aim of this style of work is to improve internal communication, mutual learning and information exchange, as well as stimulating creativity. Regarding the ratio analysis, the good condition of both organizations should be noted: the financial analysis indicators did not deteriorate. It should be stated that organizational performance is influenced by both the dependent variable and the independent variable. They can be analyzed as soft factors and solid factors. The analysis of the impact of these factors can be done using financial measures. The complementary value is constituted by the relations in the organization and the values which make it possible to more effectively implement the company's strategy, mission and vision of the business.
Źródło:
Organizacja i Zarządzanie : kwartalnik naukowy; 2021, 1; 17-27
1899-6116
Pojawia się w:
Organizacja i Zarządzanie : kwartalnik naukowy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of alliances, mergers and takeovers on efficiency of air transport
Wpływ aliansów, fuzji i przejęć na efektywność transportu lotniczego
Autorzy:
Hawlena, J.
Powiązania:
https://bibliotekanauki.pl/articles/375174.pdf
Data publikacji:
2012
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
transport lotniczy
wydajność
sojusz
fuzja
przejęcie
air transport
efficiency
alliance
merger
takeover
Opis:
Increasing competition in the air transport market leads to changes in the positioning of companies and to searching for effective means to improve economic efficiency. Effective realization of the transportation process entails considerable expenses, and obtaining financial resources is becoming more and more difficult. In the era of globalization the process of looking for the methods to improve efficiency in the air transport is considerably growing in importance. The article presents the functioning process of strategic alliances, the system of code - share agreements and the significance of the level of the Load Factor coefficient. Possibilities of establishing a new organization by means of a merger or a takeover are also presented.
Narastająca konkurencja na rynku usług transportu lotniczego prowadzi do zmiany pozycjonowania przedsiębiorstw oraz poszukiwania skutecznych sposobów poprawy efektywności ekonomicznej. Skuteczna realizacja procesu transportowego wiąże się z wydatkowaniem znacznych nakładów, a ich pozyskanie staje się coraz trudniejsze. W dobie globalizacji szczególnego znaczenia nabiera proces poszukiwania metod poprawy efektywności w transporcie lotniczym. W artykule zaprezentowano proces funkcjonowania sojuszy strategicznych, system umów code - share, oraz znaczenie poziomu współczynnika Load Factor. Przedstawiono również możliwości utworzenia nowej organizacji w wyniku fuzji lub przejęcia.
Źródło:
Transport Problems; 2012, 7, 2; 15-26
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concept of resultant corporate innovativeness assessment model
Autorzy:
Nawrocki, Tomasz L.
Powiązania:
https://bibliotekanauki.pl/articles/1879835.pdf
Data publikacji:
2020
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
corporate innovativeness evaluation
innovativeness
financial performance
efficiency
ocena innowacyjności przedsiębiorstw
innowacyjność
wynik finansowy
wydajność
Opis:
Purpose: The main reason for developing the model was to fulfil the gap in the scope of synthetic/aggregate measure of corporate innovativeness in terms of company’s results in this area and their impact on its performance. Design/methodology/approach: In the proposed concept two aspects have been considered: quantitative and qualitative results of company’s innovation activity (i) and impact of this results on financial performance of company and its efficiency (ii). Due to the fact, that access to information on innovative activities results of companies is highly diversified, proposed model provides two versions to use: one, more general, based on public sources of data (Public Data Approach) and one, more detailed, based on data which should be collected through survey research (Survey Data Approach). The basis for corporate resultant innovativeness model creation was an assumption, that the ultimate market success of the company is not determined by how many innovative solutions it implements and introduces to the market and with what force it does it, but how these solutions will be accepted by the market and what economic benefits the company will receive due to them. Findings: Proposed methodology of innovativeness assessment gives a chance to eliminate several key shortcomings of the so far used methods and concepts of corporate innovativeness measurement and assessment. Research limitations/implications: Input data accessibility, development of knowledge (rules) bases needed to perform fuzzy inference. Practical implications: Presented model gives an opportunity to assess and compare enterprises in terms of their resultant innovativeness and then to assess the impact of this innovativeness on their performance. Social implications: Assessments generated by presented model can be basis for managerial decisions inside the assessed enterprise or investment decisions of investors in the capital market. Originality/value: Original approach for aggregate corporate resultant innovativeness assessment that eliminates several weaknesses of methods used so far.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2020, 144; 363-372
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Karanja biodiesel blends on the characteristics of diesel engine
Autorzy:
Yadav, Sandeep
Kumar, Amit
Chaudhary, Abhilasha
Powiązania:
https://bibliotekanauki.pl/articles/2176951.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
Diesel engine
Karanja biodiesel
performance
combustion
emission
silnik Diesla
biodiesel Karanja
wydajność
spalanie
emisja
Opis:
Extensive research is being conducted to create and use a wide range of alternative fuels to accommodate the world's growing energy needs. The objective of this experimental investigation was to analyze the effects of Karanja biodiesel blends on the performance, combustion, and emission characteristics of a compression ignition (CI) engine vis-a-vis neat diesel. Important physical parameters of Karanja oil were examined experimentally after transesterification and determined to be within acceptable limits. BTE of Karanja biodiesel blends was about 3-8% lower than diesel. For Karanja biodiesel blends, BSFC was about 2-9% higher than diesel but exhaust gas temperature and volumetric efficiency were lower. Emissions characteristics such as nitrogen oxides, hydrocarbons, and carbon monoxide were also analyzed for various tested fuels. Karanja biodiesel blends resulted in lesser CO and HC formation. Nonetheless, NOx emissions were around 10% greater than diesel. Peak cylinder pressure, heat release rate, and maximum rate of pressure rise versus crank angle were among the combustion characteristics parameters considered in this study. Combustion analysis revealed that for Karanja biodiesel blends heat release rate and peak cylinder pressure were lower than for neat diesel. Findings indicate that Karanja biodiesel can be considered a viable diesel engine fuel.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2022, 115; 249--264
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the influence of hydrogen on the energy performance of a spark ignition engine using gasoline and bioethanol fuel mixtures
Autorzy:
Mejeras, Gabrielius
Rimkus, Alfredas
Matijošius, Jonas
Powiązania:
https://bibliotekanauki.pl/articles/2098159.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
bioethanol
hydrogen
gasoline
fuel
mixture
consumption
efficiency
bioetanol
wodór
benzyna
paliwo
mieszanka
zużycie
wydajność
Opis:
The results of experimental studies of gasoline mixed with 10% bioethanol (E10), bioethanol mixed with 15% gasoline (E85), and hydrogen– oxygen gas (HHO) supplied as an additional fuel are presented in this paper. Research was carried out to determine whether E85 with hydrogen– oxygen gas is feasible for use as a replacement fuel. During the test, a port injection HR16DE spark ignition engine was used. Experiments were carried out at a constant engine speed (n = 2000 rpm), throttle opened at 15°, using a stoichiometric mixture λ = 1.0 and a lean mixture λ = 1.1. After determining brake torque, fuel consumption data, and energy performance, the results of various fuels were determined. It was found that the highest engine brake torque was developed using E85, but at the same time, fuel consumption increased. E85 yielded the best energy efficiency for a lean mixture (λ = 1.1). A small amount of HHO gas (~ 0.95% energy) yielded a small positive effect only on using E10 fuel at λ = 1.1.
Źródło:
Transport Problems; 2021, 16, 3; 41--51
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of applying the configurational approach to business model research
Autorzy:
Kwiotkowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/392609.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
business models
configurational approach
equifinality
efficiency
fsQCA
modele biznesowe
podejście konfiguracyjne
ekwifinalność
wydajność
Opis:
The issue of business models is a current and more and more deeply analysed field of scientific research. However, despite the requirements of a solid and comprehensive research approach, capable of capturing the multidimensionality of business models, there is a continuous dissatisfaction with the conducted empirical research in this area. The aim of the article is to present the possibility of using the configurational approach and fuzzy set qualitative comparative analysis (fs/QCA) to business models research, which enables to conduct comprehensive, integrated analyses. The research was conducted on the basis of a group of 53 enterprises classified in the high-tech sector. The research provided an insight into the key and auxiliary elements of the selected business models, and the methods of their mutual interaction in the context of the configuration of these elements were monitored, at the same time providing insight into the equifinality of the configuration. The results may form the basis for a deeper discussion on the definition of business models and their core components.
Źródło:
Organizacja i Zarządzanie : kwartalnik naukowy; 2019, 2; 75-86
1899-6116
Pojawia się w:
Organizacja i Zarządzanie : kwartalnik naukowy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of food and drink intake to driving performance: a systematic review
Autorzy:
Sutalaksana, Iftikar Zahedi
Pratama, Gradiyan Budi
Yamin, Putra Alif Ramdhani
Soetisna, Herman Rahadian
Powiązania:
https://bibliotekanauki.pl/articles/374354.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
drink
driving error
driving performance
food
intake
błąd jazdy
wydajność jazdy
jedzenie
spożycie
Opis:
Human-related factors are considered to be the main cause of traffic incidents or accidents, causing 69.70% of the incidents. Several studies have been conducted to identify the relationship between drowsiness or fatigue and driving performance. Furthermore, a number of other studies not only discussed the symptoms causing drowsiness but also tried to investigate related factors that cause sleepiness or fatigue while driving. On the other hand, some discussed the quantity and quality of sleep as well as food and drink intake before and while driving. This systematic review, which is based on the PRISMA method, aims to map previous studies that investigated the effect of different food/drink consumption, either taken prior to driving or while driving, on the on-road driving characteristics of drivers. Furthermore, this article is expected to serve as a reference for further research that could potentially contribute to minimizing driving errors that lead to incident or accident. From 1871 articles screened, 7 studies related to food/drink intake and driving performance were reviewed. On the basis of the existing studies, no real evidence showing the presence of the association between food intake and the monotony of the road to decrease the driving performance has been found; therefore, further research is needed.
Źródło:
Transport Problems; 2019, 14, 1; 5-12
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristic of a critical network ARC in a service system
Autorzy:
Janáček, J.
Kvet, M.
Powiązania:
https://bibliotekanauki.pl/articles/374173.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
detrimental event
transportation performance
service system
critical arc characteristic
zdarzenie szkodliwe
wydajność transportu
system obsługi
Opis:
Vulnerability of a transportation network influences, importantly, the function of public service systems constituted on the network. To be able to study the importance of an individual network arc for proper functionality of the system, we suggested a characteristic function of the arc transit time elongation together with its upper and lower estimations. We also suggested and verified an algorithm that enables the determination of parameters of the characteristic estimation, and we provide a reader with a computational study performed with real road networks.
Źródło:
Transport Problems; 2017, T. 12, z. spec.; 141-146
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charging railway infrastructure models and their impact to competitiveness of railway transport
Autorzy:
Dolinayova, A.
Camaj, J.
Kamaj, J.
Powiązania:
https://bibliotekanauki.pl/articles/374368.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
competitiveness
railway companies
traffic performance
charging railway infrastructure model
konkurencyjność
spółki kolejowe
wydajność ruchu
Opis:
The paper deals with the impact the charging railway infrastructure access has on the competitiveness of railway transport in the selected European countries. It researched into the development of indicators that indicate the competition in the railways transport market, such as volume of transport, traffic performances, and number of trains of private railway operators compared with national operators. It used the new approach for research of the share of railway transport in the transport market. The research was based on a comparative analysis of models of charging railway infrastructure, subsidies to rail infrastructure, and development of transport performances of all rail operators. The results of research are presented in terms of freight and passenger railway transport.
Źródło:
Transport Problems; 2017, 12, 1; 139-150
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
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