1. United States Department of Health and Human Services, Public Health Service, National Institutes of Health, NIH Publication No. 82-2067;Cesarean Childbirth,1982
2. Priming of the uterine cervix with oral prostaglandin E2 in the term multigravida;Weiss;Obstet. Gynecol.,1975
3. Cervical ripening and induction of labor with intravaginal prostaglandin E2;MacLennan;Lancet,1979
4. Ripening of the term cervix with Laminaria;Tohan;Obstet. Gynecol.,1979
5. Oestrogens, Prostaglandins, and cervical ripening;Ellwood;Lancet,1979