1. Onderzoek gezinsvorming;Giessen,1982
2. voorlopige uitkomsten;Giessen;Maandstatistiek van de Bevolking,1983
3. IUDs and family planning in The Netherlands;Ketting,1980
4. De permanente registratie abortus Nederland;Ketting,1981
5. Insertions of Copper-7 IUDs in connection with induced abortions during the first trimester;Larsson;Contraception,1975