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Molin G; Johansson ML; Ståhl M et al. (April 1992). “Systematics of the Lactobacillus population on rat intestinal mucosa with special reference to Lactobacillus reuteri”. Antonie Van Leeuwenhoek61 (3): 175–83. doi:10.1007/BF00584224. PMID1325752.