1. Department of Mathematics, Graphic Era Deemed to be University, Dehradun, Uttarakhand, India.
2. Department of Mathematics, Graphic Era Hill University, Dehradun, Uttarakhand, India.
3. Department of Mathematics, Chandigarh University, Mohali, Punjab, India.
4. Department of Computer Science and Engineering, Lingaya's Vidyapeeth, Faridabad, Haryana, India.