Affiliation: | 1. Department of Mathematics, Hunan Normal University, Changsha, 410081, Hunan, People’s Republic of China 2. College of Science, Central South University of Forestry and Technology, Changsha, 410004, Hunan, People’s Republic of China 3. Indian Statistical Institute (ISI), Chennai Centre, SETS (Society for Electronic Transactions and Security), MGR Knowledge City, CIT Campus, Taramani, Chennai, 600 113, India 4. Department of Mathematics, Shantou University, Shantou, 515063, Guangdong, People’s Republic of China
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