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Publicado en línea: 14 ago 2020
Páginas: 109 - 120
Recibido: 26 oct 2019
Aceptado: 18 nov 2019
DOI: https://doi.org/10.2478/amns.2020.2.00020
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© 2020 Melaku Berhe Belay, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Berhe Belay, Melaku
Faculty of Mathematics and Statistics, Central China Normal UniversityWuhan, P.R. China
Department of Mathematics, Addis Ababa Science and Technology UniversityAddis Ababa, Ethiopia
Wang, Chunxiang
Faculty of Mathematics and Statistics, Central China Normal UniversityWuhan, P.R. China