@inbook{inbook16a13b25,
title   = {Spectroscopy characterization of humic acids isolated from amazonian dark earth soils (terra preta de índio)},
author = {Cunha, T. J. F. and Novotny, E. H. and Madari, Beata Emoke and Martin-Neto, Ladislau and Rezende, Maria Olimpia de Oliveira and Canelas, L. P. and Benites, V. de M.},
year = {2009},
publisher = {Springer},
journal   = {Amazonian dark earths: wim sombroek's vision}
}