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Publicado en línea: 15 nov 2019
Páginas: 17 - 34
Recibido: 11 dic 2017
DOI: https://doi.org/10.2478/tmmp-2019-0016
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© 2019 Dušana Babicová et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Babicová, Dušana
Mathematical Institute, Slovak Academy of SciencesKošice, Slovakia
Frič, Roman
Mathematical Institute, Slovak Academy of SciencesKošice, Slovakia