@inbook{inbook8a5a49b2,
title   = {Solid-state 'ANTIPOT.13 C' nuclear magnetic resonance characterisation of humic acids extracted from Amazonian dark earths (terra preta de índio)},
author = {Novotny, E. H. and Bonagamba, Tito José and Azevêdo, Eduardo Ribeiro de and Hayes, M. H. B.},
year = {2009},
publisher = {Springer Science},
journal   = {Amazonian Dark Earths: Wim Sombroek's vision}
}