Muhammad, U. A.; Tham, L. G.; Perumal, N.; Daud, H. M.; Yasid, N. A.; Shukor, M. Y. Assay for Heavy Metals Using an Inhibitive Assay Based on the Acetylcholinesterase from Clarias Batrachus. Bioremed Sci Technol Res 2016, 4, 6-10.