1. Invasive cancer of the cervix after cryosurgery: Pitfalls of conservative management;Sevin;Obstet. Gynecol.,1979
2. Colposcopic diagnosis of cervical neoplasia;Stafl;Obstet. Gynecol.,1973
3. Colposcopy: A scientific and practical approach to the cervix in health and disease;Coppleson,1971
4. Atlas of colposcopy;Kolstad,1977