1. Ahmed, M. K., J. E. Casida & R. E. Nichols: Bovine metabolism of organophosphorus insecticides: Significance of rumen fluid with particular reference to parathion. J. Agric. Food Chem. 1958, 6, 740–746.
2. Augustinsson, K. B.: Cholinesterasen. A study in comparative enzymology. Acta physiol. scand. 1948, 15, suppl. 52.
3. Averell, P. R. & M. V. Norris: Estimation of small amounts of 0,0-diethyl-0-p-nitrophenyl thiophosphate. Anal. Chem. 1948, 20, 753– 756.
4. Brodie, B. B. & J. Axelrod: The estimation of acetanilide and its metabolic products, aniline, N-acetyl-p-aminophenol and p-aminophenol (free and conjugated) in biological fluids and tissues. J. Pharmacol. exp. Therap. 1948, 94, 22–28.
5. Buckley, B. & J. P. Colthurst: The determination of 0,0-diethyl-0-p-nitrophenyl thiophosphate residue in tomatoes. Analyt. 1954, 79, 285–289.