O artykule
Data publikacji: 14 sie 2020
Zakres stron: 109 - 120
Otrzymano: 26 paź 2019
Przyjęty: 18 lis 2019
DOI: https://doi.org/10.2478/amns.2020.2.00020
Słowa kluczowe
© 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