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Flaig W (1959) Humic substances and plant growth in general. In: Institut für Biochemie des Bodens (ed) Lectures on soil organic matter. Braunschweig: FAL, pp 30-67
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Flaig W (1959) Considerations in the decomposition of organic matter. In: Institut für Biochemie des Bodens (ed) Lectures on soil organic matter. Braunschweig: FAL, pp 68-99
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Flaig W (1959) The decomposition of known compounds of plant residues and isolation of compounds with definite chemical constitution. In: Institut für Biochemie des Bodens (ed) Lectures on soil organic matter. Braunschweig: FAL, pp 100-130