1. Department of Mathematics, J. C. Bose University of Science and Technology, YMCA, Faridabad, Haryana, India
2. Department of Mathematics, Pt. NRS Government College, Rohtak, Haryana, India
3. Department of Applied Sciences, Punjab Engineering College (Deemed to be University), Chandigarh, India
4. Department of Mathematics, Panjab University, Chandigarh, India