1. van Heerden, J.A., Judd, E.S., Dockerty, M.B.: Carcinoma of the extrahepatic bile ducts. A clinicopathologic study. Am. J. Surg.113:49, 1967
2. Clemett, A.R.: Endoscopic retrograde cholangiopancreatography. In Radiology of the Gallbladder and Bile Ducts, R.N. Berk, A.R. Clemett, editors, Philadelphia, W.B. Saunders, 1977, pp. 255–271
3. Baddeley, H., Nolan, D.J., Salmon, P.R.: Radiological Atlas of Biliary and Pancreatic Disease, Chicago, an HM+M Publication, 1978, pp. 125–141
4. Peel, A.L.G., Dillon, E., Dellipiani, A.W.: High bile duct cancer: Incidence and pattern of investigation in the general hospital setting. Br. J. Surg.68:459, 1981
5. George, P.A., Brown, C., Foley, R.T.: Carcinoma of the hepatic duct junction. Br. J. Surg.68:14, 1981