@article{MarkantKuhnOPetal.1993,
  author    = {Markant, A and Kuhn, M and OP, Walz and Pallauf, J},
  title     = {Zur Wechselwirkung von Nicotinamid und Tryptophan auf den Proteinstoffwechsel von Aufzuchtferkeln},
  series = {J Anim Physiol Anim Nutr},
  volume    = {70},
  journal   = {J Anim Physiol Anim Nutr},
  pages     = {225 -- 235},
  year      = {1993},
  language  = {de}
}
@book{Jarre1993,
  author    = {Jarre, Jan},
  title     = {Die Honorierung {\"o}kologischer Leistungen der Landwirtschaft},
  volume    = {19/93,5},
  edition   = {1. Aufl.},
  publisher = {Evang. Akad. Loccum, Protokollstelle},
  address   = {Rehburg-Loccum},
  isbn      = {3-8172-0593-7},
  pages     = {196 S. : graph. Darst.},
  year      = {1993},
  language  = {de}
}