1. Prostaglandins in preinduction cervical ripening. Meta-analysis of worldwide clinical experience;Keirse;J Repr Med,1993
2. Local application of prostaglandin E2 for cervical ripening or induction of term labour;Ulmsten;Clin Obstet Gynecol,1983
3. Extraamniotic prostaglandin E2 for the induction of labour at term;Calder;J Obstet Gynaecol Br Comnwlth,1974
4. Current therapeutic uses of prostaglandins in obstetrics in the United Kingdom;MacKenzie;Contemp Rev Obstet Gynaecol,1993
5. Induction of labour with prostaglandin E2: a prospective audit;Gudex;N Z Med J,1993