Institution: | 1. College of Mathematics and System Sciences, Xinjiang University, Urumqi 830046, PR China;2. Department of Mathematics and Research Institute for Basic Sciences, Kyung Hee University, Seoul 130-701, Republic of Korea;1. Department of Mathematics, Zhejiang Normal University, Jinhua 321004, China;2. School of Mathematical Sciences and Shanghai Key Laboratory of Pure Mathematics and Mathematical Practice, East China Normal University, Shanghai 200241, China |