1. Further experience with pituitary extract in the induction of labor;Watson;Am J Obstet Gynecol,1922
2. The use of small dosages of pituitary extract in obstetrics;Stein;Surg Gynec Obstet,1934
3. Die künstliche Frühgeburt;Krause,1855
4. De l'accouchement provoqué;Champetier;Ann Gynécol Obstét (Paris),1888
5. Dilatation of the cervix by means of a modified Champetier de Ribes balloon;Voorhees;Med Rec,1900