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![](./images/clear.gif) 1.- CHARACTERIZATION OF HUMIC ACIDS FROM A BRAZILIAN OXISOL UNDER DIFFERENT TILLAGE SYSTEMS BY EPR, (SUPER 13) C NMR, FTIR AND FLUORESCENCE SPECTROSCOPY
ELSEVIER; AMSTERDAM; NLD; NETHERLANDS, 2004
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![](./images/clear.gif) 2.- Effect of residual vanadyl on the spectroscopic analysis of humic acids
Elsevier;; III; International, 2006
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![](./images/clear.gif) 3.- Studies of the compositions of humic acids from Amazonian dark earth soils
American Chemical Society; Washington, DC; USA; United States, 2007
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