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Changes in soil organic matter with cropping as measured by organic carbon fractions and 13 C natural isotope abundance[J] . Rod D. B. Lefroy,Graeme J. Blair,Wayne M. Strong.  Plant and Soil . 1993 (1)
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Heavy metal binding by hydrophobic and hydrophilic dissolved organic carbon fractions in a Spodosol A and B horizon[J] . Georg Guggenberger,Bruno Glaser,Wolfgang Zech.  Water, Air, & Soil Pollution . 1994 (1)