1. N. A. Protasova and A. P. Shcherbakov, Microelements (Cr, V, Ni, Mn, Zn, Cu, Co, Ti, Zr, Ga, Be, Ba, Sr, B, I, Mo) in Chernozem and Gray Forest Soils in Central Chernozem Region (Voron. Gos. Univ., Voronezh, 2003) [in Russian].
2. H. Degenhardt, Geochim. Cosmochim. Acta 11(4), 279 (1957).
3. A. P. Ratner, J. Chem. Phys. 1, 789 (1933).
4. L. M. Henderson and F. C. Kracek, J. Am. Chem. Soc. 49, 738 (1927).
5. V. V. Rachinskii, Introduction to the General Theory of Dynamics of Sorption and Chromatography (Energoizdat, Moscow, 1964; Kluwer, 1965).