Singh, L., P. Chattopadhyay, J. Kaur, K. Chattopadhyay, and N. Mishra. “Machine Learning Based Prediction and Impact Analysis of Various Lockdown Stages of COVID-19 Outbreak – A Case Study of India”. Journal of Graphic Era University, vol. 9, no. 2, June 2021, pp. 121–136, doi:10.13052/jgeu0975-1416.922.