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Tytuł:
Urdu Translation and the Validation of a 14-Item Measure to Assess Stress Management Skills in Healthcare Workers: Measurement Invariance Across Gender
Autorzy:
Ali, Yumna
Farhana Kazmi, Syeda
Powiązania:
https://bibliotekanauki.pl/articles/29433358.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Stress management skills
coping
lifestyle healthcare workers
gender
invariance
Urdu
translation and validation
Opis:
This study aims to conduct an Urdu translation and a validation of the ISBF Stress Management Skills Scale in two distinct phases. The first phase includes the forward-back translation method for ISBF. The second phase includes cross validation and the establishment of psychometric properties for the ISBF scale. A sample of 500 adults working in health care was taken from different hospitals and dispensaries. The first phase of the study includes the forward-back translation method. The second phase includes exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) with invariance measurement. The total reliability of the scale is reported to be .812. EFA revealed a two-factor structure for ISBF scale, with configural, metric and scalar invariance across males and females, and comparable latent mean scores for males and females. CFA showed goodness-of fit indices for the two factors. The scale showed good internal consistency values. The model fit value includes the value for the goodness of fit index, which was .979, for the adjusted goodness-of fit index: .961, for the comparative fit index: .993, for the incremental fit index: .993, and for the root mean square error of approximation (RMSEA) value: .033. Good values of composite reliability and convergent validity were measured for both dimensions of the scale. The scale shows that this diagnostic tool can help to assess the skills used to manage stress. For criterion validity, the coping Inventory for Stressful Situations (CISS-21) was used, which showed positive correlations. The subscale of stress management was taken from the Health Promoting Life Style Profile II (HPLP-II), which also showed positive correlations. Significant mean differences were found between scores of healthcare workers with stress management skills and with those without stress management skills. The group of mean differences indicated the females have greater stress management skills as compared to men. The Urdu translated and validated instrument will be helpful in understanding behavior in healthcare settings.
Źródło:
Ethics in Progress; 2023, 14, 1; 110-125
2084-9257
Pojawia się w:
Ethics in Progress
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
General Self-Efficacy Associations with Personality and Motivation: Psychometric Properties and Measurement Invariance of the Polish New General Self-Efficacy Scale
Autorzy:
Baran, Lidia
Janowski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/29433611.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:
ougólnione poczucie własnej skuteczności
osobowość
motywacja
niezmienność pomiarowa
general self-efficacy
personality
motivation
measurement invariance
Opis:
This study aimed to determine the validity and reliability of the Polish version of the New General Self-Efficacy Scale (NGSE). In four different samples (N = 1,837), adult respondents completed the Polish version of NGSE (NGSEpl) in combination with questionnaires assessing personality, motivation, and behavioral tendencies. Confirmatory factor analysis demonstrated a good fit for the one-factor structure. Cronbach's alpha was above .87 in all samples, and the stability of the scale was .68. Measurement invariance of NGSEpl calculated for different age groups confirmed that the scale measures the same construct in both samples. NGSEpl scores were positively related to the frequency of active coping strategies, mastery-goal orientation, and Big Five model traits and negatively to passive coping strategies. Results supported the reliability, stability, and validity of the NGSEpl.
Celem niniejszego badania było określenie trafności i rzetelności polskiej wersji Nowej Skali Uogólnionego Poczucia Własnej Skuteczności (NGSE). W czterech różnych próbach (N = 1,837) dorośli respondenci wypełnili polską wersję NGSE (NGSEpl) w połączeniu z kwestionariuszami mierzącymi osobowość, motywację i tendencje behawioralne. Konfirmacyjna analiza czynnikowa wykazała dobre dopasowanie struktury jednoczynnikowej do danych. Współczynnik alfa Cronbacha wyniósł powyżej .87 we wszystkich próbach, a stabilność skali wyniosła .68. Niezmienność pomiarowa NGSEpl obliczona dla różnych grup wiekowych potwierdziła, że skala mierzy ten sam konstrukt w obu próbach. Wyniki NGSEpl były dodatnio powiązane z częstością korzystania z aktywnych strategii radzenia sobie, motywacją mistrzostwa, wszystkimi cechami modelu Wielkiej Piątki, a ujemnie z pasywnymi strategiami radzenia sobie. Wyniki uzyskanych analiz potwierdziły zatem rzetelność, stabilność i trafność NGSEpl.
Źródło:
Studia Psychologica; 2023, 23, 1; 15-29
1642-2473
Pojawia się w:
Studia Psychologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychometric properties of the Polish version of the Generalized Anxiety Disorder Scale (GAD-7) in a non-clinical sample of employees during pandemic crisis
Autorzy:
Basińska, Beata A.
Kwissa-Gajewska, Zuzanna
Powiązania:
https://bibliotekanauki.pl/articles/21375403.pdf
Data publikacji:
2023-11-13
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
anxiety
measurement invariance
pandemics
Generalized Anxiety Disorder 7-item scale
multigroup confirmatory factor analysis
employee wellbeing
Opis:
Objectives The COVID-19 outbreak is an example of a crisis that triggered an increase in generalized anxiety disorder. The study aims to validate the Polish version of the Generalized Anxiety Disorder 7-item scale (GAD-7) by Spitzer et al. among a non-clinical sample of employees and examine the invariance depending on the gender and age of working adults. Material and Methods For assessing factor structure of the Polish version of the GAD-7, the data were collected from a sample of 821 adults employed in 4 economic sectors (health care, education, IT, public administration) during the initial phase of the COVID-19 pandemic in Poland (April 10–May 24, 2020). Due to differences in the severity of GAD symptoms across gender and age groups, the measurement invariance in these groups was tested. Results The results of a series of confirmatory factor analyses confirmed the unidimensionality of the GAD-7. The values of the composite reliability index and Cronbach’s α showed that it is a reliable tool. The GAD levels demonstrated strong relationships with professional burnout, psychological distress, and psychological complaints. These relationships were stronger than the relationships between these factors and job satisfaction. Construct, metric and scalar invariance across gender and age groups were documented. Women experienced more severe symptoms of generalized anxiety disorder than men. Generalized anxiety disorder affected 28% of respondents. Conclusions This study contributes evidence of the validation of the GAD among employees and also confirms the invariance depending on gender and age. The Polish version of the GAD-7 has good psychometric properties in a group of professionals and can be recommended for research and to be used in an occupational medicine practice, especially during crisis periods associated with the risk of developing a generalized anxiety disorder.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2023, 36, 4; 493-504
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consumer confidence, durable goods purchase and unemployment forecast
Autorzy:
Białowolski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/424992.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
consumer confidence
confirmatory factor analysis
durable goods purchase
measurement invariance
unemployment expectations
Opis:
Multi-Group Confirmatory Factor Analysis (MGCFA) demonstrated the deficiency of the four original European Commission (EC) items for consumer confidence. Fit of the MGCFA model was unacceptable and without scalar invariance, index comparison between study periods was not permissible. This provided clear motivation for a plausible alternative index specification to comply with requirements for single-dimensionality and meaning invariance throughout the study period. The MGCFA model using a new set of items demonstrated partial metric and partial scalar invariance. Using the structural equation framework, consumer confidence was revealed as strongly interrelated with unemployment forecast and durable goods purchase.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2014, 3(45); 42-55
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Survey-based household inflation expectations. Are they valid? A multi-group confirmatory factor analysis approach
Autorzy:
Białowolski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/500699.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
confirmatory factor analysis
consumer confidence indicator
consumer tendency surveys
inflation expectations
measurement invariance
Opis:
We present evidence that micro-level household inflation expectations are influenced by consumer confidence. To account for this impact, using multi-group confirmatory factor analysis, we measure the intertemporal consistency of a model comprising both consumer confidence and inflation expectations. We determine that the model exhibits the property of partial measurement invariance. Thus, we are able to account reliably for the influence of consumer confidence on inflation expectations and, simultaneously, to obtain corrected inflation expectations at the household level. It appears that, after correcting for the level of confidence, average inflation expectations at each point in time become significantly more similar to the average inflation expectations of professional forecasters and more correlated with average consumer confidence. Our analysis is based on household survey data from Poland’s State of the Households’ Survey (from 2000Q1 to 2012Q1), which is conducted in line with the European Commission’s methodology.
Źródło:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2015, 96: Analyzing and forecasting economic fluctuations; 49-67
0866-9503
Pojawia się w:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of descriptions of continuous-time and teletraffic systems
Porównanie opisów systemów teleinformatycznych oraz ciągłych w czasie
Autorzy:
Borys, A.
Aleksiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/389811.pdf
Data publikacji:
2012
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
network calculus
basic properties teletraffic systems
linearity
causality
time-invariance
associativity
commutativity
infimum convolutions
rachunek sieciowy
liniowe i niezależne od czasu systemy teleinformatyczne
własności splotu w algebrze min-plus
Opis:
In a fundamental book [5] on the so-called network calculus and research papers using this technique, as for example those cited in this paper, the notion of causal linear time-invariant teletraffic systems (networks) is used. It has been mentioned in [5] that these systems are analogous to the causal linear time-invariant systems (circuits) described by integral convolution (or convolution sum in the case of discrete ones) in classical systems theory. Note that networks considered in the network calculus are described by other type of convolution that uses the infimum operation. Moreover, the algebra used in the above technique is also different. This is the so-called min-plus (or max-plus) algebra. Therefore, it is not obvious that the teletraffic systems (networks) described by the infimum convolution fulfill the following basic properties: linearity, causality, time-invariance, associativity and commutativity of their convolution operator, known from the classical theory of systems. The objective of this paper is to prove or show in detail that the above properties hold.
W znanej monografii nt. rachunku sieciowego (network calculus), napisanej przez J.-Y. Le Boudeca i P. Thirana, zostało wprowadzone pojęcie liniowych systemów teleinformatycznych niezależnych od czasu. Wskazano w niej na podobieństwa istniejące pomiędzy powyższą klasą systemów a liniowymi systemami analogowymi niezależnymi od czasu, jednakże zrobiono to w sposób dosyć pobieżny. W tym artykule podobieństwa te są przeanalizowane w sposób systematyczny, a także bez uciekania się do bardzo abstrakcyjnej teorii systemów opisywanych za pomocą algebry min-plus – jedynie przy wykorzystaniu elementarnych pojęć matematyki wyższej. Wiele przedstawionych tutaj wyprowadzeń nie było dotychczas nigdzie publikowanych, jak na przykład twierdzenie 1.
Źródło:
Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy; 2012, 16; 5-15
1899-0088
Pojawia się w:
Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periodic solutions in multivariate invariance arguments
Autorzy:
Chudziak, J.
Wójcik, S.
Powiązania:
https://bibliotekanauki.pl/articles/254733.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
multivariate utility function
invariance
periodic solution
additive function
exponential function
Opis:
Inspired by the recent results of A.E. Abbas we determine continuous multivariate utility functions invariant with respect to a wide family of transformations related to the shift transformations.
Źródło:
Opuscula Mathematica; 2013, 33, 3; 455-465
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utility functions invariant with respect to some classes of transformations
Autorzy:
Chudziak, J.
Powiązania:
https://bibliotekanauki.pl/articles/206749.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
utility function
invariance
functional equation
additive function
exponential function
Opis:
Inspired by some relevant recent results of A. E. Abbas we determine utility functions invariant with respect to some classes of transformations.
Źródło:
Control and Cybernetics; 2013, 42, 2; 347-363
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyprowadzanie ogólnych dynamicznych równań bonitacyjnych za pomocą uniwersalnej metody rożnic algebraicznych
Derivation of Generic Dynamic Site Equations Using Generalized Algebraic Difference Approach
Autorzy:
Cieszewski, C.J.
Zasada, M.
Powiązania:
https://bibliotekanauki.pl/articles/1026347.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
metoda roznic algebraicznych
bonitacja siedliska
lesnictwo
site index model
site productivity
base−age invariance
dynamic equations
Opis:
This article describes use of the Generalized Algebraic Difference Approach for derivation of generic dynamic site equations. The generic equations are useful in situations of unspecific expectations with regards to the final model form where one wants to test simultaneously in a single fitting many various models and assumptions about the modeled processes. Equations derived in this work are extremely flexible with various patterns of polymorphisms and asymptotes. Even thought in principle the generic equations have more parameters, those derived with methodology proposed here are very parsimonious.
Źródło:
Sylwan; 2003, 147, 03; 40-46
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Validation of Theoretical and Measurement Model of the Generalized Problematic Internet Use Scale 2 in a Polish Sample
Autorzy:
Ciżkowicz, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/2125135.pdf
Data publikacji:
2022-04-26
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Generalized Problematic Internet Use (GPIU)
the cognitive-behavioral model of GPIU
Caplan GPIUS2
measurement invariance
Opis:
The Generalized Problematic Internet Use Scale (GPIUS2) was developed to operationalize the theoretical cognitive-behavioral model of GPIU.  The aims of the study were to examine the theoretical model of GPIU, analyze the psychometric properties of the GPIUS2 among Polish adolescents, study measurement invariance across gender and method of data collection (offline vs. online). The sample comprised of 1,621 participants (52% men, Mage = 20.3). Some participants completed an online version of the GPIUS2 (n = 707, 73% men, M = 17.9), and others filled in a pencil and paper version (n = 914, 35% men, M = 22.1). Reliability was assessed (Cronbach’s α; McDonald’s ω). The factor structure and nomological, convergent, and discriminant validity were tested. The findings of this study supported the reliability and the factor structure of the GPIUS2. The factor similarity in Polish sample and the original US sample was high (Tucker’s congruence coefficients were range: .99–1.00). The structural relationships between the constructs of the model, convergent and discriminant validity were confirmed. The strong measurement invariance of the model across gender and method of data collection was confirmed. The Polish version of the GPIUS2 is a reliable and valid instrument that can be used for Polish adolescent samples. The scale showed measurement invariance across gender and method of data collection. Furthermore, the results support the cognitive-behavioral model of problematic Internet use in adolescents.
Źródło:
Roczniki Psychologiczne; 2022, 25, 1; 67-85
1507-7888
Pojawia się w:
Roczniki Psychologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ontyczny status wyrażeń według de Saussure’a na tle ujęć chińskich i indyjskich teoretyków języka
Ontic Status of Expressions According to de Saussure in Comparison to the Old Chinese and Indian Conceptions
Autorzy:
Drzazgowska, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/568036.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Mikołaja Kopernika w Toruniu. Wydawnictwo UMK
Tematy:
language
expression
proportion
invariance
non-materiality
opposition
Opis:
The aim of the paper is to point out certain analogies between de Saussure’s theoretical reflection on the ontic properties of expressions and the corresponding old Chinese and Indian concepts. Following a review of de Saussure’s ideas, the author proceeds to present their Eastern analogues. The main focus is turned to the fact that the Chinese Moists as well as the Indian grammarians and philosophers elicited proportion as the key to the understanding of the mechanism of language. The Sanscrit grammarians, the philosophers of Mīmāṃsa as well as, most probably, Gongsun Long in China saw clearly the invariant and non-material nature of expressions. The Buddhist logicians and the Moists also pointed to the oppositional character of expressions as constitutive for language.
Źródło:
Linguistica Copernicana; 2013, 2(10); 51-63
2080-1068
2391-7768
Pojawia się w:
Linguistica Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Law of the iterated logarithm type results for random vectors with infinite second moments
Autorzy:
Einmahl, Uwe
Powiązania:
https://bibliotekanauki.pl/articles/747822.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Hartman-Wintner LIL, functional LIL, infinite variance, LIL behavior, very slowly varying function, cluster sets, strong invariance principle.
PIL Hartmana-Wintnera, funkcjonalne PIL, nieskonczona wariancja, zachowania typu PIL, funkcje wolno zmieniajace sie, zbiory skupien, zasada silnej niezmienniczosci.
Opis:
Ten tekst jest rozszerzona wersja prezentacji autora na konferencji A path through probability in honour of F.Thomas BRUSS które odbyła sie na Unversite Libre de Bruxelles w Brukseli w dniach 9-11 wrzesnia 2015 roku. W pierwszej czesci przedstawiam niektóre wyniki uogólniajac klasyczne prawo Hartmana-Wintnera iterowanego logarytmu dla zmiennych 1-wymiarowych z nieskonczonym drugim momentem, a nastepnie pokazuje, jak te wyniki moga byc rozszerzone do zagadnien d-wymiarowych. Wywody koncze na ogólnym funkcjonalnym prawie tego typu.
This survey paper is an extended version of the author’s presentation at the conference in honor of Professor F. Thomas Bruss at the occasion of his retirement as Chair of Math´ematiques G´en´erales from the Unversit´e Libre de Bruxelles which was held September 9-11, 2015 in Brussels. I first present some results generalizing the classical Hartman-Wintner law of the iterated logarithm to 1-dimensional variables with infinite second moments and then I show how these results can be further extended to the d-dimensional setting. Finally, I look at general functional law of the iterated logarithm type results.
Źródło:
Mathematica Applicanda; 2016, 44, 1
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perfectionism and Marital Satisfaction among Graduate Students: A Multigroup Invariance Analysis by Counseling Help-seeking Attitudes
Autorzy:
Foo, Fatt Mee
Hassan, Siti Aishah
Talib, Mansor Abu
Zakaria, Noor Syamilah
Powiązania:
https://bibliotekanauki.pl/articles/2128459.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
perfectionism
marital satisfaction
counseling help-seeking attitudes
graduate students
latent mean analysis
multigroup invariance analysis
Opis:
This study aims to measure the latent mean difference in perfectionism and marital satisfaction by counseling help-seeking attitudes. The respondents were 327 married graduate students from a research university in Malaysia. An online self-administered questionnaire was used to collect the data. The respondents completed the Almost Perfect Scale-Revised, Dyadic Almost Perfect Scale, Marital Satisfaction Scale, and Attitudes toward Seeking Professional Psychology Help Scale. Confirmatory factor analysis was used to examined the instruments and the results indicated that construct validity were achieved. The latent mean difference in perfectionism and marital satisfaction by counseling help-seeking attitudes were tested using multigroup invariance analysis. The respondents with negative attitudes toward counseling help-seeking (n = 159) reported a higher latent mean in perfectionism but a lower latent mean in marital satisfaction compared to those with positive attitudes toward counseling help-seeking (n = 168). The implications of these findings for counseling services are discussed.
Źródło:
Polish Psychological Bulletin; 2017, 2; 301-306
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Could k-NN classifier be Useful in tree leaves recognition?
Autorzy:
Horaisová, K.
Powiązania:
https://bibliotekanauki.pl/articles/229900.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
binary image
Fourier transform
affine invariance
harmonic analysis
pattern recognition
k-NN classifier
Opis:
This paper presents a method for affine invariant recognition of two-dimensional binary objects based on 2D Fourier power spectrum. Such function is translation invariant and their moments of second order enable construction of affine invariant spectrum except of the rotation effect. Harmonic analysis of samples on circular paths generates Fourier coefficients whose absolute values are affine invariant descriptors. Affine invariancy is approximately saved also for large digital binary images as demonstrated in the experimental part. The proposed method is tested on artificial data set first and consequently on a large set of 2D binary digital images of tree leaves. High dimensionality of feature vectors is reduced via the kernel PCA technique with Gaussian kernel and the k-NN classifier is used for image classification. The results are summarized as k-NN classifier sensitivity after dimensionality reduction. The resulting descriptors after dimensionality reduction are able to distinguish real contours of tree leaves with acceptable classification error. The general methodology is directly applicable to any set of large binary images. All calculations were performed in the MATLAB environment.
Źródło:
Archives of Control Sciences; 2014, 24, 2; 177-192
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On uniqueness of G-measures and g-measures
Autorzy:
Hua Fan, Ai
Powiązania:
https://bibliotekanauki.pl/articles/1287544.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
G-measures
g-measures
ergodic measures
Riesz products
quasi-invariance
dimension of measures
Opis:
We give a simple proof of the sufficiency of a log-lipschitzian condition for the uniqueness of G-measures and g-measures which were studied by G. Brown, A. H. Dooley and M. Keane. In the opposite direction, we show that the lipschitzian condition together with positivity is not sufficient. In the special case where the defining function depends only upon two coordinates, we find a necessary and sufficient condition. The special case of Riesz products is discussed and the Hausdorff dimension of Riesz products is calculated.
Źródło:
Studia Mathematica; 1996, 119, 3; 255-269
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
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