TY  - RPRT
TI  - Aphthous ulcers: a difficult clinical entity.
AU  - R G Shashy
AU  - M B Ridley
DO  - 10.1053/ajot.2000.18872
UR  - https://pubmed.ncbi.nlm.nih.gov/11115523/
ID  - 11115523
ER  -