1. Department of Applied Sciences, I.K. Gujral Punjab Technical University, Kapurthala, India
2. P.G. Department of Physics, D.A.V. College, Amritsar, India
3. Department of Applied Sciences, Beant College of Engineering and Technology Gurdaspur, Gurdaspur, India
4. P.G. Department of Physics, D.A.V. College, Jalandhar, India