1. Natural history of cervical intraepithelial neoplasia;Richart;Clin Obstet Gynecol,1967
2. Cervical cancer screening programs (Department of National Health and Welfare Task Force);Walton;Can Med Assoc J,1976
3. Cancer of the cervix: a sexually transmitted disease;Sebastian;Am J Obstet Gynecol,1978
4. Clusters of variables influencing risk of cervical cancer;Rotkin;Cancer,1968
5. Adolescent coitus and cervical cancer: association of related events with increased risk;Rotkin;Cancer Res,1968