1. Centre for Nonlinear Systems, Chennai Institute of Technology, Chennai 600069, India
2. Department of Mathematics, Faculty of Science and Technology, Phuket Rajabhat University, Phuket 83000, Thailand
3. Graduate Institute of Automation Technology, National Taipei University of Technology, Taipei 10608, Taiwan
4. Eastern Michigan Joint College of Engineering, Beibu Gulf University, Qinzhou 535011, China