1. School of Sciences (Physics), Uttar Pradesh Rajarshi Tandon Open University, Prayagraj, UP, India
2. Department of Physics, P.P.N. (P.G.) College, Kanpur, UP, India
3. Department of Physics, R.B.I.P.S.S. R, V. B. S. Purvanchal University, Jaunpur, UP, India
4. Department of Chemistry, P.P.N. (P.G.) College, Kanpur, UP, India