Affiliation: | 1. Department of Mathematics, Faculty of Science, Maejo University, Chiang Mai, Thailand;2. Department of Mathematics, Facuty of Science, King Mongkut's University of Technology Thonburi, Bangkok, Thailand;3. Department of Control and Robotics Engineering, Kunsan National University, Kunsan, Chonbuk, Republic of Korea;4. Department of Mathematics, Thiruvalluvar University, Vellore, India |