Vaghetti, J. C. P.; Brasil, J. de L.; Costa, T. M. H.; Lima, Éder C.; Benvenutti, E. V. Influence of the Synthesis Conditions on the Characteristics and Metal Adsorption Properties of the 3-(1,4-phenylenediamine)propylsilica Xerogel. Eclet. Quim. 2005, 30, 43-49.