Murad R. Wali, Waleed M Ali, Mohammad A.Khalaf. “Bacterial Co-Infection Among Hospitalized Patients With COVID-19 in Kirkuk City-Iraq”. Annals of the Romanian Society for Cell Biology, vol. 25, no. 6, July 2021, pp. 16575-84, https://www.annalsofrscb.ro/index.php/journal/article/view/8953.