1. Maiani G, Caston MJ, Catasta G, Toti E, Cambrodon IG, Bysted A, Granado-Lorencio F, Olmedilla-Alonso B, Knuthsen P, Valoti M, Bohm V, Mayer-Miebach E, Behsnilian D, Schlemmer U: Carotenoids: actual knowledge on food sources, intakes, stability and bioavailability and their protective role in humans. Mol Nutr Food Res. 2009 Sep;53 Suppl 2:S194-218. doi: 10.1002/mnfr.200800053. [PubMed:19035552]
  2. Abdel-Aal el-SM, Akhtar H, Zaheer K, Ali R: Dietary sources of lutein and zeaxanthin carotenoids and their role in eye health. Nutrients. 2013 Apr 9;5(4):1169-85. doi: 10.3390/nu5041169. [PubMed:23571649]