1. Medical studies on effect of barium in the peritoneal cavity following rupture of the colon;Zheutlin;Surgery,1952
2. Pneumatic rupture of the colon;Lapp;J. Missouri M. Soc.,1945
3. Pneumatic rupture of intestinal canal;Burt;Arch. Surg.,1931
4. Spontaneous perforation of the large bowel;Woodruff;Ann. Surg.,1952
5. Perforation following barium enema;Berk;J.A.M.A.,1952