Khalid, U. A., R. Tariq, W. . Nowshaid, and M. Qasim. “SARS-CoV-2: Resurgence of an Old Companion of SARS-CoV: Resurgence of Novel SARS-CoV-2”. PSM Microbiology, vol. 5, no. 4, Dec. 2020, pp. 102-11, https://psmjournals.org/index.php/microbiol/article/view/439.