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              Ackerman, P. L. (2000). Domain-specific knowledge as the "dark matter" of adult intelligence: Gf/Gc, personality and interest correlates. Journal of Gerontology: Psychological Sciences, 55B, 69-84.
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              Ackerman, P. L. (2000): Domain-Specifi c knowledge as the "Dark Matter" of adult intelligence: gf/ gc, personality and interest correlates. In: Journal of Gerontology, H. 2, S. 69-84
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              Ackerman, P. L., 2000: Domain-Specific Knowledge as the "Dark Matter" of Adult Intelli- gence: Gf/Gc, Personality and Interest Correlates. Journal of Gerontology: Psychologi- cal Sciences 55B: 69-84.
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