Authors
Ruoyu Wei
School of Mathematics, Southeast University, al. Southeast University,, Nanjing, China
Jinde Cao
School of Mathematics, Southeast University, al. Southeast University,, Nanjing, China
© 2018 Ruoyu Wei, Jinde Cao, published by SAN University
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.