1. Department of Physics & Research Centre, Nanjil Catholic College of Arts and Science, Kaliyakkavilai, India
2. Manonmaniam Sundaranar University, Tirunelveli, India
3. Department of Physics & Research Centre, Nesamony Memorial Christian College, Marthandam, India
4. Department of Physics & Research Centre, Holy Cross College, Nagercoil, India
5. Department of Physics & Research Centre, Women’s Christian College, Nagercoil, India
6. Department of Physics, Mar Ivanios College, Thiruvananthapuram, India
7. Department of Chemistry, Faculty of Science, University of Kragujevac, Kragujevac, Serbia
8. Department of Physics, Annai Velankanni College, Tholayavattan, India