RT Article T1 How great is G.R.E.A.T.? Results from a longitudinal quasi-experimental design JF Criminology & public policy VO 1 IS 1 SP 87 OP 118 A1 Esbensen, Finn-Aage 1951- LA English YR 2001 UL https://krimdok.uni-tuebingen.de/Record/1639623248 K1 Polizei K1 Schule K1 Präventionsprogramm K1 Evaluation K1 Gangs