1. Richards, J. and Weinman, E.J., J. Nephrology, 1996, vol. 9, no. 4, p. 160.
2. Kissinger, P.T., Pachla, L.A., Reynolds, L.D., and Wright, S., J. Assoc. Off. Anal. Chem., 1987, vol. 70, no. 1, p. 1.
3. Harper, H.A., Review of Physiological Chemistry, Los Altos, CA: Lange Medical Publ., 1977, 13th ed.
4. Dutt, V.S.E. and Mottola, H.A., Anal. Chem., 1974, vol. 46, no. 12, p. 1777.
5. Mazzali, M., Kim, Y.-G., Hughes, J., Lan, H.Y., Kivlighn, S., and Johnson, R.J., Am. J. Hypertens., 2000, vol. 13, no. 4, p. 36.