Ajmal, M., L. Ibrahim, N. Mohammed, and H. Al-Qarni. “PREVALENCE AND PSYCHOLOGICAL STRESS IN RECURRENT APHTHOUS STOMATITIS AMONG FEMALE DENTAL STUDENTS IN SAUDI ARABIA”. Medicine and Pharmacy Reports, Vol. 91, no. 2, Apr. 2018, pp. 216-21, doi:10.15386/cjmed-840.