van der Ark, Arno, et al. “[Pertussis Serological Potency Test As an Alternative to the Intracerebral Mouse Protection Test: Development, Evaluation Und Validation] [Article in German]”. ALTEX - Alternatives to Animal Experimentation, vol. 15, no. Supp. 1, Jan. 1998, pp. 33-36, https://www.altex.org/index.php/altex/article/view/2088.