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Wyświetlanie 1-15 z 1154
Tytuł:
Orthogonal models: Algebraic structure and explicit estimators for estimable vectors
Autorzy:
Pereira, Artur
Fonseca, Miguel
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729750.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
linear models
mixed models
inference
orthogonal models
UBLUE
Opis:
We study the algebraic structure of orthogonal models thus of mixed models whose variance covariance matrices are all positive semi definite, linear combinations of known pairwise orthogonal projection matrices, POOPM, and whose least square estimators, LSE, of estimable vectors are best linear unbiased estimator, BLUE, whatever the variance components, so they are uniformly BLUE, UBLUE. From the results of the algebraic structure we will get explicit expression for the LSE of these models.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2015, 35, 1-2; 29-44
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The value-based paradigm and economization of company strategy and business models
Autorzy:
Jabłoński, Adam
Powiązania:
https://bibliotekanauki.pl/articles/916180.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
business models strategy
business models
Opis:
The business processes’ constantly increasing dynamic occurred in companies forces them not only to create their new business models and strategies, but first of all to achieve appropriate profits. The aim of this paper is to discuss the role of business models strategy and economization, using the value-based paradigm. The author argues that currently designed business models and strategies should generate defined measurable financial results, at every stage of their implementation suitable to program them. Therefore, the application of such business models and strategies enables for an enterprise’s value increasing at its business development every stage.
Źródło:
Kwartalnik Nauk o Przedsiębiorstwie; 2014, 33, 4; 37-45
1896-656X
Pojawia się w:
Kwartalnik Nauk o Przedsiębiorstwie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perception of change in optimisation aspects
Autorzy:
Małecka, Joanna
Duháček Šebestová, Jarmila
Powiązania:
https://bibliotekanauki.pl/articles/28408163.pdf
Data publikacji:
2024
Wydawca:
Sopocka Akademia Nauk Stosowanych
Tematy:
change
change implementation models
motivation
optimisation
optimisation models optimisation models
Opis:
When defining optimisation, special attention should be paid to its nature. This is because it is the process of maximising the efficiency, effectiveness or usefulness of something / someone. Its business context most often concerns production processes or human resource management. Hence, change, i.e. the fact that something / someone becomes different than before, is an inherent factor supporting improvement and the processes parantelleling it. The aim of this article – against the background of relevant literature on issues related to defining and processes of implementing change in enterprises: books and academic articles, online sources – is to present the results of empirical research into the most significant determinants supporting the implementation of change in a manufacturing enterprise and employee attitudes in assessing the implementation of change, using a selected manufacturing enterprise as an example. In order to achieve the objective, two questionnaire surveys were conducted: GIN=1582022 and GIIN=1372023 using a five-point Likert scale, a scrollable list and giving the opportunity to write an individual response. To describe the research results obtained, mathematical analysis tools were used to construct tabular summaries and then present the conclusions drawn from them. The results of the survey indicated a gap in terms of motivating employees for change processes. An increase in positive attitudes towards the implementation of change (ratings: very good, good respectively) was observed at 3 % and 13 %. However, there was a general increase in the number of people who do not want to participate in polemics regarding change processes in optimisation aspects by 6 %, what more: the statistics for the negative evaluation of the introduction of such changes showed a negative trend The research provided valuable and practical information, which was used by company managers to take measures to increase the motivation of employees to perceive change processes and understand their optimising aspects in the managed company.
Źródło:
Przestrzeń, Ekonomia, Społeczeństwo; 2023, 23/I; 175-196
2299-1263
2353-0987
Pojawia się w:
Przestrzeń, Ekonomia, Społeczeństwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Income tax: a comparison of the forecasting methodologies
Autorzy:
Pavlik, Martin
Powiązania:
https://bibliotekanauki.pl/articles/425078.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
income tax
forecasting
ARCH models
GARCH models
EGARCH models
Akaike information criteria
Opis:
The author focuses on income tax forecasting. He compares the different forecasting methodologies. He also compares his solution to the official annual forecasts in the Slovak Republic. He chose the quarters of years as the time units.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 3(41); 104-112
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cloud Computing – Architecture, Platform and Security Issues: A Survey
Autorzy:
Alam, Md. Sakib Bin
Powiązania:
https://bibliotekanauki.pl/articles/1178291.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cloud Computing
Deployment Models
Security Issues
Service Models
Opis:
Cloud computing system delivers computing resources as a service over the network. During the last few years clod computing technology has gained attention due to its autonomous and cost effective services. It is responsible for the growth of IT industry. But cloud computing has various security challenges that hinder the rapid adoption of this computing paradigm. Efficient steps should be taken to make cloud computing more secure and reliable. This paper works on overview of clod computing as well as related security issues.
Źródło:
World Scientific News; 2017, 86, 3; 253-264
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using MathCad environment to calculate leakage currents and power basis on percolation models
Autorzy:
Frączak, P.
Powiązania:
https://bibliotekanauki.pl/articles/97207.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
percolation
percolation models
calculations of percolation models
in Mathcad
Opis:
This work presents the design and analysis of percolation models for branches and nodes in networks created using electric circuits. Electric circuits were built using square networks consisting of appropriate resistance and impedance elements, as well as of power supply sources. The created percolation models were described mathematically, according to the Maxwell matrix method of cyclic current in the classical form and in the complex number form. Analytical descriptions of electric circuits include random methods of "short-circuiting" branches and creation of “filled” nodes, respectively, in the networks using appropriate calculation procedures in Mathcad. Simulation calculations of surface leakage current for a polymer sample were made using a model of its surface (percolation for a branch in the network) and a numerical program developed on the basis of calculation procedures contained in Mathcad. On the other hand, simulation calculations of power emitted on the surface of a cylindrical insulator performed using its surface model (percolation for nodes in the network) and a numerical program written in the Mathcad environment.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 255-267
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reputation determinants of the banking sector in Poland
Autorzy:
Idzik, Marcin
Gieorgica, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2052147.pdf
Data publikacji:
2019-12-31
Wydawca:
Bankowy Fundusz Gwarancyjny
Tematy:
banks
reputation
structural equation models (SEM – Structural Equation Models)
Opis:
The objective of this paper is to identify the determinants of reputation of the banking sector in Poland and to segment the society according to the factors that shape the reputation. Banks in Poland have a good reputation. The factors of a good reputation are in clear advantage over the factors of a bad reputation. The most important things in shaping the banks’ reputation are the axiological determinants. Their significance is three times as high as the effectiveness determinants linked to the satisfaction with the banking services, and it is much higher than the impact of the normative determinants connected with the institutional aspects of the banking sector. The three selected homogeneous typological groups of consumers differ from each other in terms of normative, axiological and altruistic determinants that shape the reputation. The effectiveness determinants do not diversify the consumers in terms of their impact on the the banks’ reputation assessment. The most important touch points that shape the banks’ reputation are: consumers’ personal experience, customer service attendants in the banks, friends’ opinions as well as the opinions of the people who are regarded by the consumers as experts. When modelling the reputation determinants, a structural equation modelling method (SEM) was used. Studies were carried out on a nationwide representative sample of N=1000 residents of Poland using the CAPI method in March 2019.
Źródło:
Bezpieczny Bank; 2019, 77, 4; 81-109
1429-2939
Pojawia się w:
Bezpieczny Bank
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of epicotyl emergence of Quercus robur from different climatic regions is strongly driven by post-germination temperature and humidity conditions
Autorzy:
Jastrzebowski, S.
Ukalska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2077749.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
epicotyl dormancy
Richards models
growth models
acorns
ecological niche
Opis:
Pedunculate oak (Quercus robur L.) is an important component of temperate forests in the north- ern hemisphere. It occurs naturally across Europe and in parts of North Africa, the Balkans, the Urals and the Caucasus. In Poland, it predominantly grows on the plains at ≤700 m a.s.l. The main objective of this study was to determine how different temperature-humidity growth conditions influence dormancy breakage and epicotyl emergence in Q. robur, using growth curve models. We also in- vestigated whether these differences result from changes in the climatic conditions under which the oak populations grow naturally. In this study, we selected four pedunculate oak stands in western and eastern Poland. These sites were char- acterised by oceanic and continental climates, respectively. Mature acorns were collected in the autumn of 2016 and pretreated for two weeks in the cold (4 °C). The acorns were then sown in plastic pots filled with a peat/sand substrate. Four climatic variants (cold-dry, cold-wet, warm-dry and warm-wet) and a control (average conditions) were used. Epicotyl emergence was monitored daily for 74 days. Epicotyl emergence dynamics (maximum absolute growth rate, lag time, T50), number of days to epicotyl emergence, and cu- mulative epicotyl emergence were measured or calculated. The acorns from oceanic climates required more intense warm humid conditions for epicotyl emergence than those from continental climates. In contrast, acorns from continental climates had an evolutionary advantage in that their epicotyl emergence occurred both in cold-dry and warm-wet seasons. This indicated that each population was adapted to its local environment.
Źródło:
Dendrobiology; 2019, 81; 73-85
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A polytomous item response theory models using R
Politomiczne modele teorii odpowiedzi na pozycje testowe w programie R.
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/425272.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
IRT models
multidimensional IRT models
measurement theory
R software
Opis:
Item response theory (IRT) is widely used in educational and psychological research to model how participants respond to test items in isolation and in bundles. Item response theory has replaced classical measurement theory as a framework for test development, scale constructions, scree reporting and test evaluation. The most popular of the item response models for multiple choice tests are the one-parameter (i. e. the Rasch model) and threeparameter models. This is the general framework for specifying the functional relationship between a respondent’s underlying latent trait level, commonly known as ability in educational testing, or the factor score in the factor analysis tradition and an item level stimulus. In this paper, arguments are offered for continuing research and applying multidimensional IRT models. The position is also taken that multi-parameter IRT models have potentially important roles to play in the advancement of measurement theory about which models to use should depend on model fit to the test data. All calculations are conducted in R available from CRAN which is a widely-used and well-known environment for statistical computing and graphics.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2016, 2 (52); 43-52
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical Log-linear Models for Contingency Tables
Hierarchiczne modele logarytmiczno-liniowe dla tablic kontyngencji
Autorzy:
Brzezińska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/906850.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
log-linear models
hierarchical log-linear models
AIC
BIC
Opis:
Log-linear models are widely used for qualitative data in multidimensional contingency tables. Hierarchical log-linear models are models that include all lower-order terms composed from variables contained in a higher-order model term. The starting point is a saturated model, then homogenous associations, conditional independence and complete independence. There are several statistics that help to choose the best model. The first is the likelihood ratio approach, next is AIC and BIC information criteria. In R software there is loglm() function in MASS library and glm in stats library. The first approach is presented in this paper
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2012, 269
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of Hexavalent Chromium from Aqueous Solution by the Pod of Acacia gerrardii
Autorzy:
Abdulaziz, Mohammed A.
Bakri, Abdulrahman A.
Al-Zahrani, Saleh A.
Al-Zahrani, Majed S.
Al-Lehebi, Abdulrahman N.
Banjar, Fadil M.
Nabag, Mohand I.
Powiązania:
https://bibliotekanauki.pl/articles/779613.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Biosorption
chromium
Acacia gerrardii
isotherm models
Park kinetic models
Opis:
This study aims at investigating the potential of Acacia gerrardii pod for the removal of Cr(VI) in batch system. Effect of solution pH, biosorbent dosage, initial concentration of Cr(VI), contact time on the removal process was examined. Complete removal of hexavalent chromium was achieved at pH values 1.0 and 2.0 whereas maximum removal of total chromium was obtained at pH of 3.0. The study showed that the biosorption and bioreduction mechanisms were involved in the removal process. The time required for complete removal of Cr(VI) using the pod of Acacia gerrardii was shortened with an increase in biomaterial dosage and decrease in Cr(VI) concentration. Kinetic data was well described using Park kinetic model. Freundlich isotherm model adequately fitted the equilibrium data indication multilayer adsorption of total chromium on the surface of biomaterial. The pod of Acacia gerrardii could be used efficiently for the removal of hexavalent chromium from aqueous solutions.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 2; 14-19
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bayesian Variations on the Frisch and Waugh Theme
Autorzy:
Osiewalski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/483315.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bayesian inference
regression models
SURE models
VAR processes
data transformations
Opis:
The paper is devoted to discussing consequences of the so-called Frisch-Waugh Theorem to posterior inference and Bayesian model comparison. We adopt a generalised normal linear regression framework and weaken its assumptions in order to cover non-normal, jointly elliptical sampling distributions, autoregressive specifications, additional nuisance parameters and multi-equation SURE or VAR models. The main result is that inference based on the original full Bayesian model can be obtained using transformed data and reduced parameter spaces, provided the prior density for scale or precision parameters is appropriately modified.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2011, 3, 1; 39-47
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of the Mapping Models of the Players Cooperation in Serve Reception in Volleyball
Autorzy:
Mazur, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/1832377.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
volleyball
cooperation
mapping models
service reception
game models
Olympic Games
Opis:
Introduction: Identifying cooperation in team games is a difficult process to implement. Thanks to the development of methods and techniques of game observation, it is possible to reliably and accurately identify and evaluate the actions of players. The collections of various analyzes are used to create pragmatic game models. There are several types of such models. The paper presents models representing effective cooperation in the game on the example of volleyball. Aim of the study: The aim of the study was to identify mapping models of effective cooperation in the game, in the game positioning phase - in the element of receiving-passing the ball (serves). The second goal was to present the differences and similarities between observed teams. Material and methods: The work uses a method called qualitative study of unique cases, the research material consists of the four highest-ranked teams from Rio de Janeiro 2016 Olympic Games. Results: Four different models of cooperation in receiving-passing the ball (serve) were identified. Each of them contains characteristic features visible in the figures. Conclusions: Various models of cooperation have been identified. Each team has a specific model of receiving-passing the ball (serve) due to the spatial flexibility. The models presented in the paper are effective because they show the cooperation of the best teams in the world.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2021, 35, 3; 71-85
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of flotation processes by classical mathematical methods – a review
Modelowanie procesu flotacji przy pomocy klasycznych metod matematycznych – przegląd
Autorzy:
Jovanovic, I.
Miljanovic, I.
Powiązania:
https://bibliotekanauki.pl/articles/219078.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
flotation
mathematical modelling
empirical models
probabilistic models
population-balance models
kinetic models
flotacja
modelowanie matematyczne
modele empiryczne
modele probabilistyczne
modele równowagi populacji
modele kinetyczne
Opis:
Flotation process modelling is not a simple task, mostly because of the process complexity, i.e. the presence of a large number of variables that (to a lesser or a greater extent) affect the final outcome of the mineral particles separation based on the differences in their surface properties. The attempts toward the development of the quantitative predictive model that would fully describe the operation of an industrial flotation plant started in the middle of past century and it lasts to this day. This paper gives a review of published research activities directed toward the development of flotation models based on the classical mathematical rules. The description and systematization of classical flotation models were performed according to the available references, with emphasize exclusively given to the flotation process modelling, regardless of the model application in a certain control system. In accordance with the contemporary considerations, models were classified as the empirical, probabilistic, kinetic and population balance types. Each model type is presented through the aspects of flotation modelling at the macro and micro process levels.
Modelowanie procesów flotacji nie jest zagadnieniem prostym, głównie z uwagi na skomplikowany charakter samego procesu, czyli znaczną liczbę zmiennych które, w mniejszym lub w większym stopniu, mają wpływ na końcowy wynik procesu separacji cząstek materiału wykorzystującego różnice w ich właściwościach powierzchniowych. Próby stworzenia ilościowego modelu predyktywnego który w sposób pełny opisywałby przemysłowe procesy flotacji podjęto w połowie ubiegłego wieku a badania trwają po dzień dzisiejszy. W artykule przedstawiono przegląd działalności badawczej podejmowanej w celu opracowania modelu procesu flotacji opartego o zasady matematyki klasycznej. Opisu i systematyki modeli flotacji dokonano w oparciu o dostępną literaturę przedmiotu, główny nacisk kładąc na te modele, które wykorzystywane były wyłącznie do analizy procesu flotacji, bez względu na możliwość ich zastosowania także w układach sterowania. Zgodnie z obecnymi założeniami, modele sklasyfikowano jako empiryczne, probabilistyczne, kinetyczne oraz modele równowagi populacji. Każdy model zaprezentowany jest w kontekście modelowania procesu flotacji, z uwzględnieniem skali mikro oraz makro.
Źródło:
Archives of Mining Sciences; 2015, 60, 4; 905-919
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational aspects of GPU - accelerated sparse matrix - vector multiplication for solving Markov models
Obliczeniowe aspekty mnożenia macierzy rzadkiej przez wektor dla rozwiązywania modeli Markowa przyspieszanego przez karty GPU
Autorzy:
Bylina, B.
Bylina, J.
Karwacki, M.
Powiązania:
https://bibliotekanauki.pl/articles/375696.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Markovian models
wireless network models
GPU
matrix-vector multiplication
sparse matrices
Opis:
In this article we investigate some computational aspects of GPU-accelerated matrix-vector multiplication where matrix is sparse. Particularly, we deal with sparse matrices appearing in modelling with Markovian queuing models. The model we use for research is a Markovian queuing model of a wireless device. This model describes the device’s behavior during possible channel occupation by other devices. We study the efficiency of multiplication of a sparse matrix by a dense vector with the use of an appropriate, ready-to-use GPU-accelerated mathematical library, namely CUSP. For the CUSP library we discuss data structures and their impact on the CUDA platform for the fine-grained parallel architecture of the GPU. Our aim is to find the best format for storing a sparse matrix for GPU-computation (especially one associated with the Markovian model of a wireless device). We compare the time, the performance and the speed-up for the card NVIDIA Tesla C2050 (with ECC ON). For unstructured matrices (as our Markovian matrices), we observe speed-ups (in respect to CPU-only computations) of over 8 times.
Łańcuchy Markowa są przydatnym narzędziem do modelowania systemów złożonych, takich jak systemy i sieci komputerowe. W ostatnich latach łańcuchy Markowa zostały z powodzeniem wykorzystane do oceny pracy sieci bezprzewodowych. Jednym z problemów jaki się pojawia przy wykorzystywaniu łańcuchów Markowa w modelowaniu sieci są problemy natury obliczeniowej. W artykule zajmiemy się badaniem mnożenia macierzy rzadkiej przez wektor, które jest jedną z głównych operacji podczas numerycznego rozwiązywania modeli Markowowskich. Aby, przyspieszyć czas obliczeń mnożenia macierz rzadkiej przez wektor wykorzystano funkcje z biblioteki CUSP. Biblioteka jest zbiorem funkcji wykonywanych na GPU (ang.Graphics Processing Unit) celem skrócenia czasu obliczeń. Do testowania operacji mnożenia macierzy rzadkiej przez wektor badano macierze z Markowowskiego modelu pracy sieci bezprzewodowej. Model ten opisuje zachowanie urządzenia, gdy kanał transmisyjnych może być zajęty przez inne urządzenia. Macierz przejść wspomnianego modelu jest macierzą rzadką i potrzeba specialnej struktury danych do jej przechowywania, dlatego w artykule dyskutowane są różne struktury danych dla macierzy rzadkich i ich przydatność do obliczen na kartach graficznych. W pracy porównano czas, wydajność i przyspieszenie jakie otrzymano podczas testowania biblioteki CUSP na karcie NVIDIA Tesla C2050 dla niestrukturalnych macierzy rzadkich opisujących model zajętości węzła w sieciach bezprzewodowych przy różnych formatach przechowywania macierzy rzadkich. Dla testowanych macierzy zauważono ośmiokrotne przyspieszenie obliczeń przy wykorzystaniu karty graficznej.
Źródło:
Theoretical and Applied Informatics; 2011, 23, 2; 127-145
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
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