1. Hunan Province Cooperative Innovation Center for the Construction and Development of Dongting Lake Ecological Economic Zone, School of Mathematics and Computational Science, Hunan University of Arts and Science, Changde 415000, China
2. School of Mathematics and Statistics, Jishou University, Jishou 416000, China
3. HPCSIP, Ministry of Education of China, Hunan Normal University, Changsha 410081, China
4. School of Mathematics and Statistics, Hunan University of Finance and Economics, Changsha 410205, China