Δείτε το letter στην Journal of the American Medical Association από τον Philip Taylor και τον Sanford Dawsey και το reply από τους συγγραφείς της αρχικής εργασίας.
«Domestic cats convert ((2) H(8))-β-carotene to ((2) H(4))-retinol following a single oral dose». Journal of Animal Physiology and Animal Nutrition96 (4): 681–92. 2011. doi:10.1111/j.1439-0396.2011.01196.x. PMID21797934.
«Determination of carotenoids and their esters in fruits of Lycium barbarum Linnaeus by HPLC-DAD-APCI-MS». J Pharm Biomed Anal47 (4–5): 812–8. 2008. doi:10.1016/j.jpba.2008.04.001. PMID18486400.
Adewusi, Steve R A; Bradbury, J Howard (1993). «Carotenoids in cassava: Comparison of open-column and HPLC methods of analysis». Journal of the Science of Food and Agriculture62 (4): 375. doi:10.1002/jsfa.2740620411.
The Alpha-Tocopherol, Beta Carotene Cancer Prevention Study Group (1994). «The effect of vitamin E and beta carotene on the incidence of lung cancer and other cancers in male smokers». N Engl J Med330 (15): 1029–35. doi:10.1056/NEJM199404143301501. PMID8127329.
«Mortality in randomized trials of antioxidant supplements for primary and secondary prevention: systematic review and meta-analysis». JAMA297 (8): 842–57. 2007. doi:10.1001/jama.297.8.842. PMID17327526.
Mathews-Ross, Michelene (1977). «Beta Carotene Therapy for Erythropoietic Protoporphyria and Other Photosensitivity Diseases». Archives of Dermatology113 (9): 1229–1232. doi:10.1001/archderm.1977.01640090077011. PMID900968.
US patent 2609396, Inhoffen Hans Herloff & Pommer Horst, "Compounds with the carbon skeleton of beta-carotene and process for the manufacture thereof", published 1952-09-02
«Domestic cats convert ((2) H(8))-β-carotene to ((2) H(4))-retinol following a single oral dose». Journal of Animal Physiology and Animal Nutrition96 (4): 681–92. 2011. doi:10.1111/j.1439-0396.2011.01196.x. PMID21797934.
«Determination of carotenoids and their esters in fruits of Lycium barbarum Linnaeus by HPLC-DAD-APCI-MS». J Pharm Biomed Anal47 (4–5): 812–8. 2008. doi:10.1016/j.jpba.2008.04.001. PMID18486400.
The Alpha-Tocopherol, Beta Carotene Cancer Prevention Study Group (1994). «The effect of vitamin E and beta carotene on the incidence of lung cancer and other cancers in male smokers». N Engl J Med330 (15): 1029–35. doi:10.1056/NEJM199404143301501. PMID8127329.
«Mortality in randomized trials of antioxidant supplements for primary and secondary prevention: systematic review and meta-analysis». JAMA297 (8): 842–57. 2007. doi:10.1001/jama.297.8.842. PMID17327526.
Mathews-Ross, Michelene (1977). «Beta Carotene Therapy for Erythropoietic Protoporphyria and Other Photosensitivity Diseases». Archives of Dermatology113 (9): 1229–1232. doi:10.1001/archderm.1977.01640090077011. PMID900968.
«Carotenoids». Micronutrient Information Center, Linus Pauling Institute, Oregon State University. 1 Αυγούστου 2016. Ανακτήθηκε στις 19 Αυγούστου 2019.