1. Department of Physics, Government First Grade College, Kolar 563101, Karnataka, India
2. Department of Physics, Government Arts College, (Affiliated to Bharathiar University), Udumalpet 642126, Coimbatore, India
3. Department of Physics, Government College for Women, Kolar 563101, Karnataka, India
4. Rajah Serfoji Government College (Autonomous), Thanjavur 613005, Tamilnadu, India