1. Distribution-free statistical tests;Bradley,1968
2. The ontogeny of certain logical operations: Piaget's formulation examined by nonverbal methods;Braine;Psychological Monographs,1959
3. Judgments and explanations as criteria for the presence of cognitive structures;Brainerd;Psychological Bulletin,1973
4. Transitive inferences and memory in young children;Bryant;Nature,1971
5. On the acquisition of some relational terms;Donaldson,1970