Joseph, T. M., and D. K. Mahapatra. “Exploration of Two Natural Inhibitors for Treating COVID-19 from Simple Natural Products: Nature Probably Has All the Solutions”. Journal of Public Health and Sanitation, vol. 1, no. 1, July 2020, pp. 17-24, https://www.royalliteglobal.com/public-health/article/view/153.