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Lönnerholm G, Knutson L, Wistrand PJ, Flemström G (June 1989). "Carbonic anhydrase in the normal rat stomach and duodenum and after treatment with omeprazole and ranitidine". Acta Physiologica Scandinavica. 136 (2): 253–262. doi:10.1111/j.1748-1716.1989.tb08659.x. PMID2506730.