Immunohistochemical expression of p'16 POT. INK4a' and bcl-2 according to HPV type and to the progression of cervical squamous intraepithlial lesions - Guimarães, Márcia Cristina Monteiro; Gonçalves, Maria Alice Guimarães; Soares, Christiane Pienna; Bettini, Jussara de Sousa Ribeiro; Duarte, Roberta A.; Soares, Edson Garcia (Journal of Histochimical and Citochemistry, 2005)