Al-Saeed, Ammar F Hamza, and Ahlam T Mohammed. 2013. “Oral Health Status in Relation to Selected Salivary Elements Among a Group of Gasoline Stations Workers”. Journal of Baghdad College of Dentistry 25 (3): 125-29. https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/270.