Kropp, J. P., von Bloh, W., Block, A., Klenke, T., Schellnhuber, H. J. (1994): Characteristic Multifractal Element Distributions in Recent Bioactive Marine Sediments. - In: Characteristic Multifractal Element Distributions in Recent Bioactive Marine Sediments, (Fractals and Dynamic Systems in Geoscience), 369-375.