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2. C.F. Johnston, E. Tombácz, in: J.B. Dixon, D.G. Schulze (Eds.), Soil Mineralogy with Environmental Applications, SSSA, Madison, Wisconsin, USA, 2002 (Chapter 2).
3. G.R. Aiken, D.M. McKnight, R.L. Wershaw, P. MacCarthy, Humic Substances in Soil, Sediment and Water, Interscience, New York, 1985.
4. G. Sposito, The Surface Chemistry of Soils, Oxford University Press, Oxford, 1984.
5. J.M. Bigham, R.W. Fritzpatrick, D.G. Schulze, in: J.B. Dixon, D.G. Schulze (Eds.), Environmental Particles, SSSA, Madison, Wisconsin, USA, 2002 (Chapter 10).