Authors
Feng Qi
School of Mathematical Sciences, Tianjin Polytechnic University, Tianjin, China
College of Mathematics, Inner Mongolia University for Nationalities, Tongliao, China
School of Mathematics and Informatics, Henan Polytechnic University, Jiaozuo, China
Bai-Ni Guo
School of Mathematics and Informatics, Henan Polytechnic University, Jiaozuo, China