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Characteristics of soil humic substances fractionated in relation to particle weight. VI. Particle weight distribution, optical properties, and infrared absorption spectra of fractions of humic acids with different particle weightsTOMIKAWA, A; OBA, Y.Soil Science and Plant Nutrition (Tokyo). 1991, Vol 37, Num 2, pp 211-221, issn 0038-0768, 11 p.Article