Klein, Harald, et al. “[Characteristics of Toxoplasma-Gondii-Tachyzoites from Different Culture Systems] [Article in German]”. ALTEX - Alternatives to Animal Experimentation, vol. 15, no. Supp. 1, Jan. 1998, pp. 37-39, https://www.altex.org/index.php/altex/article/view/2089.