Korsun, Neli, Ivelina Trifonova, Veselin Dobrinov, Iliyana Grigorova, Svetla Angelova, and Ivaylo Alexiev. “SARS-COV-2: INSIGHT INTO THE EMERGING GENETIC VARIANTS: Mini Review”. PROBLEMS of Infectious and Parasitic Diseases 49, no. 3 (February 25, 2022): 5–11. Accessed April 16, 2025. https://pipd.ncipd.org/index.php/pipd/article/view/49-3-1-sars-cov-2-insight.