1. Immature delivery (second trimester abortion);Puyenbroek;Thesis,1979
2. Over de partus immaturus;Slot,1979
3. Factors influencing perinatal wastage;Alberman,1974
4. Growth and composition of the fetus and newborn;Widdowson,1970
5. On intra-uterine growth. The significance of prenatal care;Kloosterman;Int J Gynecol Obstet,1970