A. M. M. Godoi, G. M. Muza, M. P. Costa, and M. L. T. Gama, “ The use of psychoactive substances by private school children in the Federal District of Brazil ”, Rev. saúde pública, vol. 25, no. 2, pp. 150–156, Apr. 1991, doi: 10.1590/S0034-89101991000200010.