1. School of Mathematics and the Research Center for Complex Systems and Network Sciences, Southeast University, Nanjing, China
2. School of Mathematics, Frontiers Science Center for Mobile Information Communication and Security, Southeast University, Nanjing, China
3. School of Mathematics and Computer Science, Yunnan Minzu University, Kunming, China
4. Department of Electrical Engineering, Yeungnam University, Gyeongsan, Republic of Korea