Chen, Tzyh-Shi, et al. “[Intracellular Calcium and PH As Sensitive Parameters of Toxicity in Neural Cell Culture] [Article in German]”. ALTEX - Alternatives to Animal Experimentation, vol. 11, no. 4, Nov. 1994, pp. 216-9, https://www.altex.org/index.php/altex/article/view/1693.