Fiasse, R., Eyssen, HJ., Leonard, JP., Dive, C., & Massonet, R. (1983). Fecal Bile-acid Analysis and Intestinal-absorption in Crohns-disease Before and After Ileal Resection. European Journal of Clinical Investigation, 13(3), 185-192. https://doi.org/10.1111/j.1365-2362.1983.tb00086.x (Original work published 1983)