RT Article T1 Community variations in violence: The role of social ties and collective efficacy in comparative context JF Journal of research in crime and delinquency VO 47 IS 1 SP 3 OP 30 A1 Mazerolle, Lorraine 1964- A1 McBroom A1 Wickes, Rebecca A2 McBroom A2 Wickes, Rebecca LA English YR 2010 UL https://krimdok.uni-tuebingen.de/Record/1912485613 DO 10.1177/0022427809348898