@article{article986b8b6b,
title   = {Effects of sewage sludge amendment on the properties of two Brazilian oxisols and their humic acids},
author = {Bertoncini, E. I. and D’Orazio, V. and Senesi, N. and Mattiazzo, Maria Emília},
year = {2008},
doi = {10.1016/j.biortech.2007.09.024},
journal   = {Bioresource Technology}
}