J. C. Igwe and A. A. Abia, “Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk”, Electron. J. Biotechnol., vol. 10, no. 4, pp. 0–0, Oct. 2007.