@article{RuehlHamscherGarciaetal.2004,
  author    = {Ralph R{\"u}hl and Gerd Hamscher and Ada Garcia and Heinz Nau and Florian J. Schweigert},
  title     = {Identification of 14-hydroxy-retro-retinol and 4-hydroxy-retinol as endogenous retinoids in rats throughout neonatal development},
  year      = {2004},
}