Institution: | 1. School of Mathematical Science, Heilongjiang University, Harbin 150080, China;2. School of Mathematics and Statistics, Southwest University, Chongqing 400715, China;1. School of Mathematical Sciences, Tongji University, Shanghai 200092, China;2. College of Information Technology, Shanghai Ocean University, Shanghai 201306, China;3. Department of Mathematics and Physics, Anyang Institute of Technology, Anyang 455000, China |