Zhang, Qihu
School of Mathematics and Statistics, Huazhong Normal University, Wuhan, Hubei 430079, China
Academic administration, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China
Department of Mathematics and Information Science, Zhengzhou University of Light Industry, Zhengzhou, Henan 450002, China
zhangqh1999@yahoo.com.cn; Qiu, Zhimei
School of Mathematics and Statistics, Huazhong Normal University, Wuhan, Hubei 430079, China
zhimeiqiu@yahoo.com.cn; Wang, Yan
School of Mathematics and Statistics, Huazhong Normal University, Wuhan, Hubei 430079, China
wangyan2158@yahoo.com.cn
(2015-01-17)