1. MLS Prof’s Unit, Indian Association for the Cultivation of Science, Kolkata-700032, India
2. Department of Physics, University of Calcutta, Kolkata-700009, India
3. Department of Physics, M.U.C. Women’s College, Burdwan-713104, India
4. University School of Basic and Applied Science (USBAS), Guru Govind Singh Indraprastha University, New Delhi-110075, India