Gassmann, Max, and Ulrich Hübscher. “[Use of Polyclonal Antibodies from Egg Yolk of Immunised Chickens (minireview)] [Article in German]”. ALTEX - Alternatives to Animal Experimentation, vol. 9, no. 1, Mar. 1992, pp. 5-14, https://www.altex.org/index.php/altex/article/view/1826.