1. Bishop EH. Pelvic scoring for elective induction. Obstet Gynecol 1964; 24:266–8.
2. Calder AA. Cervical ripening. In: Bydgeman M, Berger G, Keith L, eds. Prostaglandin and its inhibitors in clinical obstetrics and gynecology. Lancaster: MTB Press, 1986.
3. Lange AP, Secher NJ, Westergaard JC, Skovgard, I. Prelabor evaluation of inducibility. Obstet Gynecol 1982; 60:137–47.
4. Kotier E, Husslein P, Langer M, Fuchs AR, Fuchs F. Die Bedeutung der Oxytocinempfindiich-keit für den spontanen Wehenbeginn beim Menschen. Geburtshilfe Frauenheilk 1983; 43:533–7.
5. Huszar G, Cabrol D, Naftolin E. The relationship between myometrial contractility and cervical maturation in pregnancy and labor. In: Huszar G, ed. The physiology and biochemistry of the uterus in pregnancy and labor. Boca Raton: CRC Press, 1986.