1. Births: final data for 2003;Martin,2005
2. Labor induction rate variation in upstate New York: what is the difference?;Glantz;Birth,2003
3. Cesarean delivery after elective induction in nulliparous women: the physician effect;Luthy;Obstet Gynecol,2004
4. The length of labor;Calkins;Am J Obstet Gynecol,1931
5. Pelvic scoring for elective induction;Bishop;Obstet Gynecol,1964