1. Department of Mathematics; Thiruvalluvar University; Vellore 632115 India
2. School of Mathematics; Southeast University; Nanjing 211189 China
3. School of Electrical Engineering; Nantong University; Nantong 226019 China
4. School of Mathematics and Statistics, Shandong Normal University; Ji'nan 250014 China
5. Chongqing Engineering Research Center of Internet of Things and Internet Control Technology, and School of Mathematics and Statistics; Chongqing Three Gorges University; Wanzhou 404100 China