1. Barshad, I 1948. Vermiculite and its relation to biotite as revealed by base exchange reaction, X-ray analysis, differential thermal curves and water content. Amer. Mineral. 33:655–678.
2. Barshad, I 1951. Cation exchange in soils. I. Ammonium fixation and its relation to potassium fixation and to determination of ammonium exchange capacity. Soil Sci. 72:361–371.
3. Bhattacharyya, A K 1971. Mechanism of the formation of exchangeable ammonium nitrogen immediately after waterlogging of rice soils. J. Indian Soc. Soil. Sci. 19:209–213.
4. Birrell, K S and Gradwell, M 1956. Ion-exchange phenomena in some soils containing amorphous mineral constituents. J. Soil Sci. 7:130–147.
5. Burchill, S and Hayes, M H B 1981. Adsorption. In: Greenland, D J and Hayes, M H B (eds.), The Chemistry of Soil Processes. pp. 221–600. John Wiley & Sons Ltd. Chichester.