RT Article T1 The nature and characteristics of attention-deficit hyperactivity disorder JF School psychology review VO 20 IS 2 SP 163 OP 173 A1 Frick, P. J. A1 Lahey, B. B. LA English YR 1991 UL https://krimdok.uni-tuebingen.de/Record/1640153721 K1 Kinder K1 Hyperaktivität