1. Induction and augmentation;American College of Obstetricians,1987
2. The economic advantages of measured change in health care: an example from obstetrics;Brown;Obstet Gynecol,1994
3. The morphology of the human cervix;Danforth;Clin Obstet Gynecol,1983
4. Labor induction;Ramsey;Curr Opin Obstet Gynecol,2000
5. Spontaneous and induced cervical ripening: natural dilation and effacement process and current cervical ripening techniques;Hayashi;J Reprod Med,1993