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Publicado en línea: 03 jul 2020
Páginas: 67 - 84
Recibido: 29 dic 2019
Aceptado: 30 dic 2019
DOI: https://doi.org/10.2478/amns.2020.2.00014
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© 2020 Morteza Sharifi et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Sharifi, Morteza
Department of Math, Shahed UniversityTehran, Iran
Raesi, Behruz
Department of Math, Shahed UniversityTehran, Iran