Roldan, P. dos S.; de Alcântara, I. L.; Rocha, J. C.; Padilha, C. do C. F.; Padilha, P. M. Determination of Copper, Iron, Nickel and Zinc in Fuel Kerosene by FAAS After Adsorption and Pre-Concentration on 2-Aminothiazole-Modified Silica Gel. Eclet. Quim. 2004, 29, 33-40.