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Publicado en línea: 16 jul 2020
Páginas: 164 - 178
Recibido: 23 oct 2019
DOI: https://doi.org/10.2478/ausm-2020-0011
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© 2020 Virgilius-Aurelian Minuţă, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Minuţă, Virgilius-Aurelian
Babeş-Bolyai University of Cluj-Napoca, Faculty of Mathematics and Computer Science Department of Mathematics