1. Stratification of bile in the gallbladder and cholelithiasis;Campbell;Surg. Gynec. & Obst.,1949
2. Value of upright position in demonstration of floating gallstones;Elsey;Am. J. Roentgenol.,1951
3. The diagnostic evaluation of erect positioning in cholecystography;Feldman;Radiology,1953
4. A new position for cholecystography;Kirklin;Am. J. Roentgenol.,1948
5. Cholecystography: a critical analysis of failures in diagnosis;Levine;Am. J. Digest. Dis.,1957