Minhas, S., A. Sajjad, M. Kashif, F. Taj, H. Alwadaani, and Z. Khurshid. “Oral Ulcers Presentation in Systemic Diseases: An Update”. Open Access Macedonian Journal of Medical Sciences, vol. 7, no. 19, Oct. 2019, pp. 3341-7, doi:10.3889/oamjms.2019.689.