@inproceedings{inproceedingsee05a470,
title   = {Compositions of the humic acids in amazonian anthropogenic dark earth soils},
author = {Novotny, Etelvino Henrique and Hayes, Michael H. and Azevêdo, Eduardo Ribeiro de and Madari, Beata Emoke and Cunha, Tony J. F. and Bonagamba, Tito José},
year = {2006},
publisher = {International Union of Soil Sciences - IUSS},
booktitle   = {World Congress of Soil Science}
}