@article{PuvogelBaumruckerSauerweinetal.2005,
  author    = {Gerke Puvogel and C. R. Baumrucker and H. Sauerwein and R. Ruhl and E. Ontsouka and H. M. Hammon and J. W. Blum},
  title     = {Effects of an enhanced vitamin A intake during the dry period on retinoids, lactoferrin, IGF system, mammary gland epithelial cell apoptosis, and subsequent lactation in dairy cows},
  year      = {2005},
}