1. Department of Physics, Baba Ghulam Shah Badshah University Rajouri, Jammu & Kashmir, India
2. Department of Physics, Hemvati Nandan Bahuguna Garhwal University (A Central University), Srinagar (Garhwal), Uttarakhand, India
3. Applied Science and Humanities Department, G. B. Pant Institute of Engineering & Technology, Pauri Garhwal Uttarakhand, India
4. Department of Physics, Himalayiya University Doiwala, Dehradun, Uttarakhand, India
5. Department of Physics, Ramjas College, University Enclave, University of Delhi, India