1. Department of Chemistry, Acharya Nagarjuna University, Guntur, India
2. Department of Physics, V.R. Siddhartha Engineering College, Vijayawada, India
3. Department of Chemistry, V.R. Siddhartha Engineering College, Vijayawada, India
4. Department of Physics, P. B. Siddhartha College of Arts & Science, Vijayawada, India