Grant DS, Bartram CI. A preliminary study of the possible benefits of using carbon dioxide insufflation during double-contrast barium enema. The British Journal of Radiology 1986; 59:190-191.

Sumanac K, et al. Minimizing post-colonoscopy abdominal pain by using CO2 insufflation. Gastrointestinal Endoscopy 2002; 56(2):190-194.