Silva, I.R., Smyth, T.J., Israel, D.W., Raper, C.D. and Rufty, T.W. (2001) Magnesium is more efficient than calcium in alleviating aluminum rhizotoxicity in soybean and its ameliorative effect is not explained by the Gouy-Chapman-Stern model. Plant & Cell Physiology, 42, 538-545.