Barasa, S. S. ., W. O. . Okenyo, and T. A. O. . Akenga. “Discovery of Withaphysalin A and Limonin As Potential SARS-COV2 Papain-Like Protease Inhibitors”. Africa Environmental Review Journal, vol. 5, no. 1, June 2022, pp. Pg 261-283, doi:10.2200/aerj.v5i1.56.