F. R. da Veiga, F. B. Russomano, M. J. de Camargo, A. C. S. Monteiro, A. Tristão, and G. V. e Silva, “Prevalence of high-grade squamous intraepithelial lesions and cervical cancer among patients with unsatisfactory colposcopic examination, without visible lesion”, Sao Paulo Med J, vol. 127, no. 5, pp. 266–269, Sep. 2009.