Pimenta, A. S.; Silva Santana, J. A. da; Anjos, R. M. dos; Melo Benites, V. de; Araújo, S. O. CHARACTERIZATION OF HUMIC ACIDS DERIVED FROM CHARCOAL OF TWO TREE SPECIES: Mimosa Tenuiflora AND Aspidosperma Pyrifolium. Green Journal 2009, 4, 01-11.