1. School of Advanced Sciences & Languages, Department of Mathematics, VIT Bhopal University, Kottri Kalan (Village) 466 114, Sehore (District), Madhya Pradesh, India
2. Department of Mathematics, National Institute of Technology Puducherry, Karaikal 609609, India
3. Department of Basic Sciences & Humanities, GMR Institute of Technology, Rajam 532 127, Srikakulam (Dt), Andhra Pradesh, India
4. DIT University, Dehradun 248009, Uttarakhand, India