RT Article T1 The effect of the level of aggression in the first grade classroom on the course and malleability of aggressive behavior into middle school (Vol. 10, 169, 1998) JF Development and psychopathology VO 11 IS 1 SP 193 OP 193 A2 Brown, C. Hendricks A2 Ialongo, Nick A2 Merisca, Rolande LA English YR 1999 UL https://krimdok.uni-tuebingen.de/Record/1639534229 K1 Gewalt K1 Schulen