Fuentes Lupton, J. R., Steinbach, G., Chang, W. C., O'Brien, B. C., Wiese, S., Stoltzfus, C. L., ... & Winn, R. J. (1996). Calcium supplementation modifies the relative amounts of bile acids in bile and affects key aspects of human colon physiology. The Journal of nutrition, 126(5), 1421-1428.Irving, M. H., & Catchpole, B. (1992). ABC of colorectal diseases. Anatomy and physiology of the colon, rectum, and anus. BMJ: British Medical Journal, 304(6834), 1106.