RT Article T1 Effectiveness of school-based programs to reduce bullying: A commentary JF Journal of experimental criminology VO 8 IS 4 SP 433 OP 441 A1 Smith, Peter K. 1943- A2 Cowie, Helen A2 Salmivalli, Christina LA English YR 2012 UL https://krimdok.uni-tuebingen.de/Record/1912527758 DO 10.1007/s11292-012-9142-3