1. Department of Mathematics, School of Basic Sciences & Research, Sharda University, Greater Noida– 201306, Uttar Pradesh, India. Noida Institute of Engineering & Technology, Greater Noida, India.
2. Department of Mathematics, School of Basic Sciences & Research, Sharda University, Greater Noida– 201306, Uttar Pradesh, India.
3. Department of Mathematics, J. C. Bose, University of Science and Technology, YMCA Faridabad- 121006, Haryana, India.