Wei-Dong Jiang

Department of Information Engineering, Weihai Vocational University, Weihai, Shandong, China

Qiu-Ming Luo

Department of Mathematics, Chongqing Normal University, Chongqing City, China

Feng Qi

College of Mathematics, Inner Mongolia University for Nationalities, Tongliao City, Inner Mongolia Autonomous Region, China
Department of Mathematics, College of Science, Tianjin Polytechnic University, Tianjin City, China;Institute of Mathematics, Henan Polytechnic University, Jiaozuo City, Henan Province, China