1. Changes with age in problem solving;Arenberg,1982
2. Plasticity and enhancement of intellectual functioning in old age: Penn State's adult development and enrichment project (ADEPT);Baltes,1982
3. Intellectual abilities;Botwinick,1977
4. Structural invariance in the developmental analysis of learning;Brainerd,1983
5. Model-based approaches to storage and retrieval development;Brainerd,1985