Anchordoqui, Luis, Eugene Chudnovsky, and Thomas Paul. “Risk Assessment of COVID-19 Airborne Infection During Hybrid Learning”. International Journal of Medical Science and Clinical Invention 8, no. 02 (February 24, 2021): 5246–5250. Accessed November 22, 2024. https://valleyinternational.net/index.php/ijmsci/article/view/2959.