1. Acute cholecystitis—planned cholecystectomy at any time during the course of the disease;Pearce;Pennsylvania M. J.,1955
2. Clinical Roentgenology of the Digestive Tract;Feldman,1948
3. Cholecystography: a critical analysis of failures in diagnosis;Levene;Am. J. Digest. Dis.,1957
4. Relation of density of cholecystographic shadows of gallbladder to iodine content;Joffe;Radiology,1942
5. The non-visualized gallbladder;Martin;New England J. Med.,1952