1. Roentgen examination of the gallbladder and bile ducts;Hodes,1965
2. Cholecystectomy following a normal cholecystogram;DeMuth;Am Surg,1969
3. The biliary tract;Kerley,1958
4. Cholesterosis of the gallbladder;Mitty;Gastroenterology,1957
5. Gallbladder stones in patients with negative gallbladder X-rays;White;Am Surg,1971