1. Gort Engovation, Aero-Propulsion, Biophysics and Nanomechanics, Southmere Ave., Bradford, BD73NU, England, UK
2. Mathematics Department, National Institute of Technology, Delhi, India
3. Physics and Astronomy Department, University College London (UCL), Gower Street, London, UK
4. Department of Mathematics, Banasthali University, Jaipur (Raj.) –302001, India