1. Tietz, N. W. (1986),Clinical Chemistry, Saunders, Philadelphia, 959–964.
2. Korell, U. and Lennox, R. B. (1992),Anal. Chem. 64, 147–151.
3. McCornick, D. B. and Wright, L. D. (1979),Methods in Enzymology, vol. 62, Part D, Academic, New York, 3–30.
4. Greenway, G. M. and Ongomo, P. (1990),Analyst 115, 1297–1299.
5. Lazaro, F., Luque de Castro, M. D., and Valcarcel, M. (1987),Analusis 15, 183–187.