Scharmann, Wolfgang. “[Accommodation of Laying Hens in the Laboratory in Accordance With Animal Welfare Requirements] [Article in German]”. ALTEX - Alternatives to animal experimentation 13, no. 3 (August 1, 1996): 136–139. Accessed May 7, 2024. https://www.altex.org/index.php/altex/article/view/1630.