Authors
Yaping Mao
Department of Mathematics, Qinghai Normal University, Center for Mathematics and Interdisciplinary Sciences of Qinghai Province, Xining
Zhao Wang
School of Mathematical Sciences, Beijing Normal University, Beijing, China
© 2019 Yaping Mao, Zhao Wang, Kinkar Ch. Das, published by Ovidius University of Constanta
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.