1. Department of Computer Science, Kazi Nazrul University, Asansol, India
2. Centre for Distance and online Education, The University of Burdwan, Burdwan, India
3. Department of Mathematics, School of Applied Science, Haldia Institute of Technology, Haldia, India
4. Department of Mathematics, NIT, Durgapur, Durgapur, India
5. Department of Computer Science and Engineering, NIT, Durgapur, Durgapur, India