RT Article T1 Defining bullying - Towards a clearer general understanding and more effective intervention strategies JF School psychology international VO 17 IS 4 SP 317 OP 329 A1 Arora, C. M. J. LA English YR 1996 UL https://krimdok.uni-tuebingen.de/Record/1639158464 K1 Schule K1 Aggression