TY  - JOUR 
T1  - Trends in drug use among students in Brazil: analysis of four surveys in 1987, 1989, 1993 and 1997
JO  - Brazilian Journal of Medical and Biological Research
A1  - Galduróz, J.C.F.
A1  - Noto, A.R.
A1  - Nappo, S.A.
A1  - Carlini, E.A.
SN  - 0100-879X
UL  - 10.1590/S0100-879X2004000400009
VL  - 37 
Y1  - 2004
PB  - Brasil 
ER  -