P53 in biopsies of oral squamous cell carcinoma: a comparative study with a malignancy grading system - Araújo, Vera Cavalcanti de; Loyola, A M; Pinto Júnior, Décio dos Santos; Borra, R C; Araújo, Ney Soares de (European Journal of Cancer. Part B, Oral Oncology, 1997)