title: Effect of two free-time reinforcement procedures on academic performance in a class of behavior problem children.
mesh_terms: D000124:Achievement; D000293:Adolescent; D001521:Behavior Therapy; D002648:Child; D002653:Child Behavior Disorders / Q000628:therapy*; D002674:Child, Institutionalized; D005260:Female; D005793:Generalization, Psychological; D006801:Humans; D008297:Male; D012055:Reinforcement Schedule; D012054:Reinforcement, Psychology