T. Happila, J. Jemshad, C. Sambathkumar, S. A. Syed Abbas, V. Vasanth. “COVID-19 Indoor Safety Monitoring System”. Annals of the Romanian Society for Cell Biology (May 2, 2021): 235–244. Accessed May 19, 2026. http://www.annalsofrscb.ro/index.php/journal/article/view/4281.