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2. The history of twins as a criterion of the relative powers of nature and nurture;Galton;J. Anthropol. Inst.,1875
3. F. Galton, Royal Anthropological Institute of Great Britain and Ireland 6 (1876) 391-406. Reprinted with slight revision.
4. Born together-reared apart: the landmark Minnesota twin study;Segal,2012
5. Behavioral Genetics;See Plomin,2013