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Publicado en línea: 15 nov 2019
Páginas: 63 - 76
Recibido: 03 oct 2019
DOI: https://doi.org/10.2478/tmmp-2019-0020
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© 2019 Ján Haluška et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Haluška, Ján
Mathematical Institute, Slovak Academy of SciencesKošice, Slovakia
Jastrzębska, Małgorzata
Institute of Mathematics and Physics, Siedlce University of Natural Sciences and HumanitiesSiedlce, Poland