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Publicado en línea: 01 ene 2022
Páginas: 1 - 8
Recibido: 12 oct 2020
DOI: https://doi.org/10.2478/tmmp-2021-0001
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© 2021 Mathematical Institute, Slovak Academy of Sciences
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Nowakowski, Piotr
Institute of Mathematics, Łódź University of TechnologyŁódź, POLAND
Institute of Mathematics, Czech Academy of SciencesPrague, CZECH REPUBLIC