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Publicado en línea: 14 dic 2020
Páginas: 173 - 181
Recibido: 13 may 2020
Aceptado: 25 nov 2020
DOI: https://doi.org/10.2478/mjpaa-2021-0013
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© 2020 Samih Lazaiz, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Lazaiz, Samih
LaSMA Laboratory, Department of Mathematics, Faculty of Sciences Dhar El Mahraz, University Sidi Mohamed Ben AbdellahFes, Morocco