«Complementary Multianalytical Approach To Study the Distinctive Structural Features of the Main Humic Fractions in Solution: Gray Humic Acid, Brown Humic Acid, and Fulvic Acid.». J Agric Food Chem., 57, 8, 2009, pàg. 3266–72. DOI: 10.1021/jf8035353. PMID: 19281175 [Consulta: 31 març 2009].
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«Complementary Multianalytical Approach To Study the Distinctive Structural Features of the Main Humic Fractions in Solution: Gray Humic Acid, Brown Humic Acid, and Fulvic Acid.». J Agric Food Chem., 57, 8, 2009, pàg. 3266–72. DOI: 10.1021/jf8035353. PMID: 19281175 [Consulta: 31 març 2009].