Al-Ghurabei, Batool H. “Role of Salivary Tumor Necrosis Factor-Alpha and Immunoglobulin- A in Recurrent Aphthous Stomatitis”. Journal of the Faculty of Medicine Baghdad, vol. 53, no. 2, July 2011, pp. 207-10, https://doi.org/10.32007/jfacmedbagdad.532876.