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Flaig W (1959) Chemistry of quiones in so far as they concern chemistry of humic substances. In: Institut für Biochemie des Bodens (ed) Lectures on soil organic matter. Braunschweig: FAL, pp 150-240
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Flaig W (1959) Chemistry of fulvic and humic acids. In: Institut für Biochemie des Bodens (ed) Lectures on soil organic matter. Braunschweig: FAL, pp 250-296
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Flaig W (1959) Experiments of the formation of synthetic humic acids. In: Institut für Biochemie des Bodens (ed) Lectures on soil organic matter. Braunschweig: FAL, pp 297-302
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