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Christl, Stefan U.; Bartram, Peter; Paul, Astrid; Kelber, Elisabeth; Scheppach, Wolfgang; Kasper, Heinrich . (1997). Bile Acid Metabolism by Colonic Bacteria in Continuous Culture: Effects of Starch and pH. Annals of Nutrition and Metabolism, 41(1), 45–51. doi:10.1159/000177977 
10.1159/000177977