"Mouth ulcers". North East Valley Division of General Practice. Retrieved 2006-06-18.
nih.gov
ncbi.nlm.nih.gov
Orbak R, Cicek Y, Tezel A, Dogru Y (March 2003). "Effects of zinc treatment in patients with recurrent aphthous stomatitis". Dent Mater J22 (1): 21–9. பப்மெட்:12790293.