1. Department of Computer Science & Engineering, Maulana Abul Kalam Azad University of Technology, BF-142, Sector-1, Salt Lake City, Kolkata 700 064, India
2. Department of Computer Science & Engineering, Swami Vivekananda Institute of Science & Technology, Dakshin Gobindapur, P.S.: Sonarpur, Kolkata 700 145, India
3. Department of Physics, University of Western Australia, M013, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia