Falkner, Erwin, Manfred Hartbauer, Harald Schöffl, Helmut Appl, and Helmut A. Tritthart. 1997. “[The ‘3R’ Concept on the Internet I] [Article in German]”. ALTEX - Alternatives to Animal Experimentation 14 (1):22-23. https://altex.org/index.php/altex/article/view/1609.