1. College of Mathematics and Information Science, Leshan Normal University, Leshan 614000, China.
2. Division of Computer Engineering, Hoseo University, Asan 31499, Republic of Korea
3. School of Mathematics and Statistics, Shandong University of Technology, Zibo 255049, China.
4. School of Mathematical Sciences, Sichuan Normal University, Chengdu 610068, China.
5. School of Mathematics, ABa Teachers University, Wenchuan 623002, China.