Siham M. Kareem, Salahddin Y. Bapir,. “How to Limit the Spread of COVID-19 in Residential Buildings: Erbil City As a Case Study”. Design Engineering (July 13, 2021): 2635- 2647. Accessed May 2, 2024. http://www.thedesignengineering.com/index.php/DE/article/view/2657.