@inproceedings{inproceedingsad476bca,
title   = {Characterisation of pyrogenic carbon humic acids by solid state NMR},
author = {Novotny, Etelvino Henrique and Hayes, M. H. B. and Azevêdo, Eduardo Ribeiro de and Benites, V. M. and Madari, Beata Emoke and Cunha, T. J. F. and Bonagamba, Tito José},
year = {2006},
publisher = {University of Padova},
booktitle   = {Symposium on NMR Spectroscopy in Soil and Geo Sciences}
}