Institution: | 1. School of Mathematics and Statistics, Guizhou University,Guiyang 550025, China;2. CHP-LCOCS, School of Mathematics and Statistics, Hunan Normal University,Changsha 410081, China;1. School of Mathematics Science, Huaiyin Normal University, Huaian 223300, PR China;2. School of Mathematics and Statistics, Northwest Normal University, Lanzhou, 730070, PR China |