1. Chongqing University of Science and Technology, Chongqing Higher Education Mega Center, School of Electrical and Information Engineering, Huxi Campus, Chongqing, People’s Republic of China
2. Luoyang Normal University, Department of Mathematics, luolong RD, Luoyang, Henan Province, People’s Republic of China
3. Chongqing Normal University, Chongqing Higher Education Mega Center, Department of Mathematics, Huxi Campus, Chongqing, People’s Republic of China