Adsorption and separation of cations on chemically modified silica gel synthesised via the sol–gel process
Alexandre G. S. Prado, Luiza N. H. Arakaki and Claudio Airoldi
J. Chem. Soc., Dalton Trans.,
2001, P. 2206 - 2209
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http://dx.doi.org/10.1039/b102478g