Sachsenberg, S., Klenke, T., Krumbein, W., Schellnhuber, H. J., & Zeeck, E. (1993). Direct graphite furnace atomic absorption spectrometric determination of metals in seawater - application of new palladium modifiers and a fractal approach to the analytic support of palladium modifiers. Analytica Chimica Acta, 279(2), 241-251.