1. Cholecystitis and cholelithiasis; an analytical report of 1104 operative cases;Adams;Surg., Gynec. & Obst.,1947
2. In Textbook of Surgery;Cole,1946
3. Ewing, J.: Quoted by Cole (ref. 2).
4. Graham, E. A.: Quoted by Cole (ref. 2).
5. Carcinoma of gallbladder, extrahepatic bile ducts and major duodenal papilla;Gray;S. Clin. North America,1941