@article{SchweigertBok2000,
  author    = {Schweigert, Florian J. and Bok, V.},
  title     = {Vitamin A in blood plasma and urine of dogs is affected by the dietary level of vitamin A},
  year      = {2000},
  language  = {en}
}
@article{RailaBokBuchholzetal.1997,
  author    = {Raila, Jens and Bok, V. and Buchholz, Ingeborg and Schweigert, Florian J.},
  title     = {Untersuchungen zum Vitamin-A-Stoffwechsel der Niere des Hundes},
  year      = {1997},
  language  = {de}
}
@article{BokSchweigert1997,
  author    = {Bok, V. and Schweigert, Florian J.},
  title     = {Untersuchungen zum Einfluß unterschiedlicher Vitamin A-Gehalte im Futter auf die Konzentration von Vitamin A im Plasma und die Ausscheidungen von Vitamin A {\"u}ber den Harn von Hunden},
  year      = {1997},
  language  = {de}
}
@article{RailaBokBuchholzetal.1997,
  author    = {Raila, Jens and Bok, V. and Buchholz, Ingeborg and Schweigert, Florian J.},
  title     = {Investigations on the excretion of vitamin A as retinol and retinyl esters bound to a high molecular complex},
  year      = {1997},
  language  = {en}
}