1. Pelvic scoring for elective induction;Bishop;Obstet Gynecol,1964
2. Prelabour evaluation of inducibility;Lange;Obstet Gynecol,1982
3. Prerequisites of preincubation and induction of labour;Calder;Eur J Obstet Gynecol Reprod Biol,1983
4. Relation of prelabour evaluation to inducibility and the course of labour;Friedman;Obstet Gynecol,1966
5. An evaluation of preinduction scoring systems;Hughey;Obstet Gynecol,1976