Affiliation: | (1) Centre of Advanced Study in Radio Physics and Electronics, University of Calcutta, 700 009 Calcutta, India;(2) Department of Applied Mathematics, University of Calcutta, 700 009 Calcutta, India;(3) Department of Physics, Bejoy Narayan Mahavidyalaya, Itachuna, Hooghly, Pin-712 147, West Bengal, India |