1. Ryan IT: Biliary tract motility.In Physiology of the Gastrointestinal Tract. R Johnson (ed.). New York, Raven Press, 1981, pp 473–494
2. Ivy AC, Oldberg E: Hormone mechanism for gallbladder contraction and evacuation. Am J Physiol 85:599–613, 1928
3. Sandblom P, Voegtlin WL, Ivy AC: The effect of cholecystokinin on the choledochoduodenal mechanism (sphincter of Oddi). Am J Physiol 113:175–180, 1935
4. Magee DF: Physiology of Gallbladder in the Biliary System. Blackwell, Oxford, 1965, pp 233–247
5. Raih TJ, Ashmore CS, Wilson FD, De Coose JJ, Hogan WJ, Dodds WJ, Steff JJ: Effect of enteric hormones on the canine choledochal sphincter. Gastroenterology 64:A104–787, 1973