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Bouchard, T.; Lykken, D.; McGue, M; Segal, N.; Tellegen, A . (1990). Sources of human psychological differences: the Minnesota Study of Twins Reared Apart. Science, 250(4978), 223–228. doi:10.1126/science.2218526 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research