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WikiPedia: Acid_humic http://books.google.com/books?id=-sFpPTDMyrMC&pg=P... http://books.google.com/books?id=VFzVAAAAMAAJ&q=Th... http://books.google.com/books?id=sG4oAAAAMAAJ&q=pl... http://www.biosci.ohio-state.edu/~soilecol/Full%20... //pubmed.ncbi.nlm.nih.gov/18970442 //pubmed.ncbi.nlm.nih.gov/19281175 //doi.org/10.1016%2F0098-3004(94)90038-8 //doi.org/10.1016%2FS0065-2113(02)75003-7 //doi.org/10.1016%2Fj.talanta.2005.07.037 //doi.org/10.1021%2Fjf8035353