1. Department of Physics, Acharya Nagarjuna University, A.P, India
2. Department of Physics, Dhanekula Institute of Engineering & Technology, Vijayawada, A.P, India
3. Department of Chemistry, Andhra Loyola College, Vijayawada, A.P, India
4. Department of Physics, Andhra Loyola College, Vijayawada, A.P, India