1. Professor, Dept. of Applied Mathematics, Indian School of Mines, Dhanbad 826004, India.
2. Research Scholar, Dept. of Applied Mathematics, Indian School of Mines, Dhanbad 826004, India (corresponding author).
3. Post-Doctoral Fellow, Dept. of Earth Sciences, Indian Institute of Science Education and Research, Kolkata 741246, India.
4. Research Scholar, Dept. of Applied Mathematics, Indian School of Mines, Dhanbad 826004, India.