1. Padma Kanya Multiple Campus, Tribhuvan University, Kathmandu, Nepal
2. Amrit Campus, Tribhuvan University, Kathmandu, Nepal
3. Ratna Rajya Laxmi Campus, Tribhuvan University, Kathmandu, Nepal
4. Central Department of Mathematics, Tribhuvan University, Kathmandu, Nepal
5. Department of Mathematics and Statistics, San Diego State University, San Diego, CA, USA
6. Computational Science Research Center, San Diego State University, San Diego, CA, USA
7. Viral Information Institute, San Diego State University, San Diego, CA, USA