1. Oral ulcerations;Fischman;Semin Dermatol,1994
2. Oral pathology, clinical-pathologic correlations;Regezi,1993
3. Oral and maxillofacial pathology;Neville,1995
4. Medication can induce severe ulcerations;Siegel;JADA,1991
5. Differential diagnosis of oral lesions;Wood,1991