1. Department of Electronics, D. P. Vipra College, Bilaspur, India
2. Department of Physics, R.T.M. Nagpur University, Nagpur, India
3. Department of Physics, Janata Mahavidyalaya, Chandrapur, India
4. Sevadal Mahila Mahavidyalaya, Sakkardara Square, Nagpur, India