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Publicado en línea: 18 nov 2017
Páginas: 1 - 11
Recibido: 19 nov 2015
DOI: https://doi.org/10.1515/tmmp-2017-0001
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© 2017 Małgorzata Filipczak et al., published by De Gruyter Open
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Filipczak, Małgorzata
Faculty of Mathematics and Computer Sciences, Łódź UniversityŁódź, Poland
Ivanova, Gertruda
Institute of Mathematics, Pomeranien University in SłupskSłupsk, Poland