1Rayburm WF,Wapner RJ,Barss VA,et al.An intravaginal controlled-release prostaglandin E 2 pessary for cervical ripening and initation of labor at term[].Obstetrics and Gynecology.1992
2Witter FR,Rocco LE,Johnson TRB.A randomized trial of prostaglandin E 2 in a controlle-drelease vaginal pessary for cervical ripening at term[].American Journal of Obstetrics and Gynecology.1992
3Wing DA,Jones MM,Rehall A,et al.A comparison of misoprostol and prostaylandin E2 gel for preinduction cervical ripening and labor induction[].American Journal of Obstetrics and Gynecology.1995
