1. 1. M. H. B. Hayes, P. MacCarthy, R. L. Malcolm, and R. S. Swift, in “Humic Substances II. In Search of Structure”, ed. M. H. B. Hayes, P. MacCarthy, R. L. Malcolm, and R. S. Swift, 1989, John Wiley & Sons, New York, 18.
2. 2. F. J. Stevenson, in “Humic Substances in Soil, Sediment and Water”, ed. G. R. Aiken, D. M. McKnight, R. L. Wershaw, and P. MacCarthy, 1985, Wiley, New York, 13.
3. Ion binding to natural organic matter: competition, heterogeneity, stoichiometry and thermodynamic consistency
4. 4. E. M. Perdue, in “Humic Substances in Soil, Sediment and Water”, ed. G. R. Aiken, D. M. McKnight, R. L. Wershaw, and P. MacCarthy, 1985, Wiley, New York, 493.
5. A Comparison of Natural Humic Acids with Synthetic Humic Acid Model Substances : Characterization and Interaction with Uranium(VI)