please, I need to find 2 articles,

1. G.L EllmanA colorimetric method for determining low concentrations of mercaptans

Arch. Biochem. Biophys., 74 (1958), pp. 443-450

2.

G.L Ellman, D Courtney, V Andres, R.M FeatherstoneA new and rapid colorimetric determination of acetylcholinesterase activity

Biochem. Pharmacol., 7 (1961), pp. 88-95

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