1. Integration vs. differentiation of fluid-crystallized intelligence in old age;Baltes;Developmental Psychology,1980
2. The critical importance of appropriate methodology in the study of aging: The sample case of psychometric intelligence;Baltes,1979
3. Enhancement of intellectual functioning in old age: Penn State's Adult Development and Enrichment Project (ADEPT);Baltes,1981
4. Constructing cognitive operations linguistically;Beilin,1976
5. All-or-none subprocesses in the learning of complex sequences;Bjork;Journal of Mathematical Psychology,1968