@article{article572da7aa,
title   = {Determination of cocaine and cocaethylene in urine by solid-phase microextraction and gas chromatography-mass spectrometry},
author = {Yonamine, Maurício and Saviano, Alessandro Morais},
year = {2006},
doi = {10.1002/bmc.643},
journal   = {Biomedical Chromatography}
}