Institution: | 1. School of Mathematics and Computer Science, Fujian Normal University, Fuzhou 350117, China;2. Department of Mathematics and Physics, Fujian Jiangxia University, Fuzhou 350108, China;1. Department of Mathematics and Physics, Bengbu University, Bengbu 233030, PR China;2. School of Management Science and Engineering, Anhui University of Finance & Economics, Bengbu 233000, PR China |