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Publicado en línea: 18 nov 2017
Páginas: 13 - 28
Recibido: 10 dic 2015
DOI: https://doi.org/10.1515/tmmp-2017-0002
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© 2017 Stanisław Kowalczyk et al., published by De Gruyter Open
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Kowalczyk, Stanisław
Institute of Mathematics, Pomeranian University in SłupskSłupsk, Poland
Turowska, Małgorzata
Institute of Mathematics, Pomeranian University in SłupskSłupsk, Poland