Kitamura N, Tanimoto A, Hondo E, Andrén A, Cottrell DF, Sasaki M, Yamada J (2001). "Immunohistochemical study of the ontogeny of prochymosin--and pepsinogen-producing cells in the abomasum of sheep". Anatomia, Histologia, Embryologia. 30 (4): 231–235. doi:10.1046/j.1439-0264.2001.00326.x. PMID11534329.
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Kitamura N, Tanimoto A, Hondo E, Andrén A, Cottrell DF, Sasaki M, Yamada J (2001). "Immunohistochemical study of the ontogeny of prochymosin--and pepsinogen-producing cells in the abomasum of sheep". Anatomia, Histologia, Embryologia. 30 (4): 231–235. doi:10.1046/j.1439-0264.2001.00326.x. PMID11534329.