1. Department of Mathematics, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Tamilnadu, India
2. Department of Mathematics, Bharathiar University, Coimbatore, Tamilnadu, India
3. Department of Mathematical Sciences, United Arab Emirates University, Al Ain, Abu Dhabi, United Arab Emirates;
4. Department of Mechanical Engineering, Keimyung University, Daegu, South-Korea