1. Department of Mathematics, National Institute of Technology Calicut, Calicut, Kerala, India
2. Department of Mathematics, Sir Syed College, Taliparamba, Kannur, Kerala, India
3. Department of Industrial & Manufacturing Engineering, NDSU Dept, North Dakota State University, Fargo, North Dakota, USA
4. Department of Applied Sciences, Vidya Academy of Science and Technology, Trissur, Kerala, India