1. Department of Mathematics, University of Petroleum & Energy Studies, Dehradun, India.
2. School of Engineering and Computing, Dev Bhoomi Uttarakhand University, Dehradun, India.
3. Department of Mathematics, Computer Science & Engineering, Graphic Era Deemed to be University, Dehradun, India. & Institute of Advanced Manufacturing Technologies, Peter the Great St. Petersburg Polytechnic University, 195251 Saint Petersburg, Russia.
4. School of Computer Science, University of Petroleum & Energy Studies, Dehradun, India
5. Department of Mathematics, Graphic Era Hill University, Dehradun, India.