Halle, Willi, and Horst Spielmann. “[Prediction of Acute Toxicity (LD50) from Cytotoxicity Data (IC50x) for a Group on the Updated ‘register of Cytotoxicity Data’ (RCD)] [Article in German]”. ALTEX - Alternatives to Animal Experimentation, vol. 11, no. 3, Aug. 1994, pp. 148-53, https://www.altex.org/index.php/altex/article/view/1700.