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2. pelvic scoring for elective induction;Bishop;Obstet Gynaecol,1964
3. Induction of labour;Turnbull;J Obstet Gynaecol Br Commonw,1968
4. Cervical ripening with prostaglandin E2 vaginal suppositories;Buchanan;Obstet Gynaecol,1984
5. The effect of vaginal administration of various doses of prostaglandin E2 gel on cervical ripening and induction of labour;Graves;Am J Obstet Gynecol,1985