Bielig, Hans-Joachim Max Planck Institute for Medical Research, Max Planck Society;
http://link.springer.com/content/pdf/10.1007%2F978-3-662-28629-6_14.pdf (Any fulltext)
http://link.springer.com/chapter/10.1007%2F978-3-662-28629-6_14 (Any fulltext)
Bielig, H.-J. (1955). Carotinoide und A-Vitamine. In Bausteine des Tierkörpers I (pp. 954-1068). Heidelberg: Springer Berlin Heidelberg.