@article{articleec530319,
title   = {Quality of cocaine seized in 1997 in the street-drug market of São Paulo city, Brazil},
author = {Carvalho, Débora Gonçalves de and Midio, Antonio Flavio},
year = {2003},
doi = {10.1590/s1516-93322003000100007},
journal   = {Revista Brasileira de Ciências Farmacêuticas}
}