Affiliation: | 1. College of Mathematics and Computer Science, Key Laboratory of High Performance Computing and Stochastic Information Processing, Ministry of Education of China, Hunan Normal University, Changsha, Hunan 410081, China;2. College of Mathematics and Computational Science, Sun-Yat-sen University, Guangzhou, Guangdong 510275, China;3. Department of Mathematics, Wayne State University, Detroit, MI 48202, USA |