1. Jindal Global Business School, O.P. Jindal Global University, Sonipat-131001, Haryana, India.
2. Department of Mathematics, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
3. Laboratoire de Mathématiques (LAMA) UMR 5127, Université Savoie Mont Blanc, CNRS, F–73000 Chambéry, France.