T. Ismail, Sara, and Eman A. Sulaiman. “Overview of the Potential Role of Trace Elements in COVID-19: doi.org 10.26538 Tjnpr V6i6.2”. Tropical Journal of Natural Product Research (TJNPR), vol. 6, no. 6, June 2022, pp. 836-41, https://www.tjnpr.org/index.php/home/article/view/6.