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2. Centraal Bureau voor de Statistiek. “Overledenen naar doodsoorzaak, leeftijd en geslacht C.B.S. annual publication serie A1.” pp. 1950–1981 's-Gravenhage: Staatsuitgeverij
3. Does screening by “Pap” smears help prevent cervical cancer?;Clarke,1979
4. The role of cervical cytology in the declining morbidity and mortality of cervical cancer;Cramer;Cancer,1974
5. Effect of cervical cancer screening in Scandinavia;Day;Obstet. Gynecol.,1984