@article{article3d6fd6ed,
title   = {Copper and zinc quantification in contaminated soil as evaluated by chemical extractants},
author = {Silva, Maria Ligia de Souza and Trevizam, Anderson Ricardo and Vitti, Godofredo Cesar},
year = {2008},
doi = {10.1590/s0103-90162008000600015},
journal   = {Scientia Agricola}
}