@article{MuellerRailaAltenkampetal.2012,
  author    = {K. Mueller and Jens Raila and Rainer Altenkamp and D. Schmidt and R. Dietrich and Andrea Hurtienne and M. Wink and O. Krone and Leo Brunnberg and Florian J. Schweigert},
  title     = {Concentrations of retinol, 3,4-didehydroretinol, and retinyl esters in plasma of free-ranging birds of prey},
  journal   = {Journal of animal physiology and animal nutrition},
  volume    = {96},
  number    = {6},
  pages     = {1044 -- 1053},
  doi       = {10.1111/j.1439-0396.2011.01219.x},
  year      = {2012},
}