Authors
Qiaoping Li
School of Mathematics and Statistics, Xidian University,, Xi’an, China
School of Mathematical Sciences, Henan Institute of Science and Technology,, Xinxiang, China
Sanyang Liu
School of Mathematics and Statistics, Xidian University,, Xi’an, China
Yonggang Chen
School of Mathematical Sciences, Henan Institute of Science and Technology,, Xinxiang, China