1. Interpregnancy interval. Association with birth weight, stillbirth and neonatal death;Erickson;J. Epidemiol. Community Health,1978
2. The influence of the birth of malformed child on the mother’s further reproduction;Record;Br. J. Prev. Soc. Med.,1975
3. A study of the fertility of mothers of twins;Record;J. Epidemiol. Community Health,1978
4. Introduction;Preston,1978
5. Perinatal mortality by birth order within cohorts based on sibship size;Bakketeig;R. Med. J.,1979