1. Relationship between length of gestation and cervical dilatation. Uterine contractibility and other factors during pregnancy;Anderson;American Journal of Obstetrics and Gynecology,1969
2. Environmental and obstetrical factors in prematurity: with special reference to experience in Aberdeen;Baird;Bulletin of World Health Organization,1962
3. The influence of advancing gestation on group B streptococcal colonization in pregnant women;Baker;American Journal of Obstetrics and Gynecology,1975
4. Epidemiology of preterm birth: results from longitudinal study of births in Norway;Bakketeig,1981
5. An epidemiologic study of preterm delivery;Berkowitz;American Journal of Epidemiology,1981