Ghanam, Ryad, Edward Boone, and Abdel-Salam Abdel-Salam. “SEIRD Model for Qatar COVID-19 Outbreak”. Letters in Biomathematics 8, no. 1 (February 18, 2021): 19–28. Accessed May 8, 2021. https://lettersinbiomath.journals.publicknowledgeproject.org/index.php/lib/article/view/319.