RT Article T1 The Philadelphia foot patrol experiment: a randomized controlled trial of police patrol effectiveness in violent crime hotspots JF Criminology VO 39 IS 3 SP 795 OP 831 A2 Ratcliffe, Jerry LA English YR 2011 UL https://krimdok.uni-tuebingen.de/Record/1626644926 K1 Fußstreife K1 Hot Spots K1 Abschreckung K1 Gewaltkriminalität K1 Öffentliche Sicherheit