1. Department of Mathematics & Centre for Research and Development, KPR Institute of Engineering and Technology, Coimbatore 641 407, Tamil Nadu, India
2. Department of Mathematics, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
3. Department of Mathematics, Sri Vasavi College, Erode, Tamil Nadu, India
4. Department of Mathematics, K.S.Rangasamy College of Technology, Tiruchengode, Namakkal, Tamilnadu, India
5. Mathematics Department, Faculty of Science and Technology, Suan Dusit University, Bangkok 10300, Thailand