À propos de cet article
Publié en ligne: 14 août 2020
Pages: 109 - 120
Reçu: 26 oct. 2019
Accepté: 18 nov. 2019
DOI: https://doi.org/10.2478/amns.2020.2.00020
Mots clés
© 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