1. Assistant Professor, Dept. of Applied Mathematics, Birla Institute of Technology, Mesra, Ranchi, Jharkhand 835215, India.
2. Professor, Dept. of Mathematics, School of Applied Sciences, KIIT Univ., Patia, Bhubaneswar 751024, India (corresponding author).
3. Professor, Dept. of Applied Mathematics, Birla Institute of Technology, Mesra, Ranchi, Jharkhand 835215, India.