1. Academic Department, National Institute of Open Schooling (NIOS), Ministry of HRD, Govt. of India, NOIDA-201309, India
2. Materials Science & Metallurgical Engineering, Maulana Azad National Institute of Technology, Bhopal-462051, India
3. Department of Physics, University Institute of Engineering & Technology, Chhatrapati Shahu ji Maharaj University, Kanpur-208024 (UP), India