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Tobias Wolfram & Damien Morris: Conventional twin studies overestimate the environmental differences between families relevant to educational attainment. npj Science of Learning, 17.7.2023, 8. vsk, nro 24. Artikkelin verkkoversio.
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Bouchard TJ, McGue M: Genetic and environmental influences on human psychological differences. Journal of Neurobiology, January 2003, 54. vsk, nro 1, s. 4–45. PubMed:12486697doi:10.1002/neu.10160