@article{galduróz_noto_nappo_carlini_2004,  title={Trends in drug use among students in Brazil: analysis of four surveys in 1987, 1989, 1993 and 1997},  volume={37},  ISSN={0100-879X},  url={https://doi.org/10.1590/S0100-879X2004000400009},  DOI={10.1590/S0100-879X2004000400009},  number={4},  journal={Brazilian Journal of Medical and Biological Research},  publisher={Associação Brasileira de Divulgação Científica},  author={Galduróz, J.C.F. and Noto, A.R. and Nappo, S.A. and Carlini, E.A.},  year={2004},  month={Apr},  pages={523–531} }