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Publicado en línea: 30 abr 2020
Páginas: 115 - 130
DOI: https://doi.org/10.2478/awutm-2018-0019
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© 2018 Violeta Crai et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Crai, Violeta
Department of Mathematics, West University of TimişoaraTimişoara, Romania
Megan, Mihail
Academy of Romanian Scientists, West University of Timişoara, Faculty of Mathematics and Computer SciencesTimişoara, Romania