Kaul, Artur, Micha Nübling, Martina Kempfer, Ivo Schmidt, and Johannes Löwer. 1998. “[Development of an Alternative Method to the Monkey Neurovirulence Test for Oral Poliovirus Vaccines] [Article in German]”. ALTEX - Alternatives to Animal Experimentation 15 (Supp. 1):18-20. https://www.altex.org/index.php/altex/article/view/2081.