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von Lintig, Johannes; Vogt, Klaus (2000). «Filling the Gap in Vitamin A Research: Molecular Identification of An Enzyme Cleaving Beta-carotene to Retinal». Journal of Biological Chemistry275 (16): 11915-11920. PMID10766819. doi:10.1074/jbc.275.16.11915.
Lin, Min; Zhang, Min; Abraham, Michael; Smith, Susan M.; Napoli, Joseph L. (2003). «Mouse Retinal Dehydrogenase 4 (RALDH4), Molecular Cloning, Cellular Expression, and Activity in 9-cis-Retinoic Acid Biosynthesis in Intact Cells». Journal of Biological Chemistry278 (11): 9856-9861. PMID12519776. doi:10.1074/jbc.M211417200.