@article{article3ee60997,
title   = {Organic acids in the rhizosphere and phytoavailability of sewage sludge-borne trace elements},
author = {Pires, Adriana Marlene Moreno and Marchi, Giuliano and Prezotto, Maria Emilia Mattiazzo and Guilherme, Roberto Guimarães},
year = {2007},
doi = {10.1590/s0100-204x2007000700002},
journal   = {Pesquisa Agropecuária Brasileira}
}