RT Article T1 A cluster-analytic study of substance problems and mental health among street youths JF American journal of drug and alcohol abuse VO 25 IS 4 SP 639 OP 660 A1 Adlaf, Edward M. A1 Zdanowicz, Y. M. LA English YR 1999 UL https://krimdok.uni-tuebingen.de/Record/1639674454 K1 Straßenjugendliche K1 Drogenabhängigkeit