1. S. J. Campus, Soban Singh Jeena Uttarakhand University, Almora 263601, India
2. Department of Mathematics, Uttarkhand Open University, Haldwani 263139, India
3. Pt. L. M. S. Campus, Sridev Suman Uttarakhand University, Rishikesh 246201, India
4. Department of Mechanical Engineering, College of Engineering, Qassim University, Buraydah 51452, Saudi Arabia