1. Site of delivery of nulliparae;van Alten;Huisarts Wetenschap,1977
2. The adequacy of the selection system in obstetrical care;Smits;Thesis,1981
3. The fetal cardiotachogram in primiparae;Voorhorst;Thesis,1977
4. Changes in umbilical artery blood gas values with the onset of respiration;Ullrich;Biol. Neonate,1972
5. Variations in acid-base equilibrium with early and late cord ligature;Schurz;Z. Geburtshilfe Perinatol,1973