RT Article T1 Reducing school bullying: evidence-based implications for policy JF Crime and justice VO 38 SP 281 OP 345 A1 Farrington, David 1944-2024 A2 Ttofi, Maria M. LA English YR 2009 UL https://krimdok.uni-tuebingen.de/Record/1391511611 K1 Mobbing K1 Schule K1 Gewalt K1 Richtlinien