RT Article T1 Problem-oriented policing, deterrence, and youth violence: An evaluation of Boston's Operation Ceasefire JF Journal of research in crime and delinquency VO 38 IS 3 SP 195 OP 225 A1 Braga, Anthony Allan 1969- A1 Piehl, Anne Morrison 1964- A1 Waring, Elin J. 1959- A1 Kennedy, David M. 1958- A2 Piehl, Anne Morrison 1964- A2 Waring, Elin J. 1959- A2 Kennedy, David M. 1958- LA English YR 2001 UL https://krimdok.uni-tuebingen.de/Record/1912665352 DO 10.1177/0022427801038003001