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Holland, Linda Z. (2007). „Developmental biology: A chordate with a difference”. Nature. 447 (7141): 153—155. PMID17495912. doi:10.1038/447153a.
Moore, T.; Holmes, P. D. (1971). „The production of experimental vitamin A deficiency in rats and mice”. Laboratory Animals. 1971 (5): 239—250. PMID5126333. doi:10.1258/002367771781006492.