Nourmohammadi, Mohammad, Ramezan Mirzaei, Ebrahim Taban, and Saeed Yari. “Effect of Ventilation System on Spread and Control of Infections (COVID-19) in Indoor Environments: Based on Current Studies”. Asian Pacific Journal of Environment and Cancer 3, no. 1 (October 28, 2020): 55-58. Accessed November 29, 2021. http://waocp.com/journal/index.php/apjec/article/view/589.