Green AS, Tang G, Lango J, Klasing KC, Fascetti AJ (2011). ”Domestic cats convert ((2) H(8))-β-carotene to ((2) H(4))-retinol following a single oral dose”. Journal of Animal Physiology and Animal Nutrition 96 (4): sid. 681–92. doi:10.1111/j.1439-0396.2011.01196.x. PMID 21797934.
Green AS, Tang G, Lango J, Klasing KC, Fascetti AJ (2011). ”Domestic cats convert ((2) H(8))-β-carotene to ((2) H(4))-retinol following a single oral dose”. Journal of Animal Physiology and Animal Nutrition 96 (4): sid. 681–92. doi:10.1111/j.1439-0396.2011.01196.x. PMID 21797934.