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Chetty, R.; Hendren, N.; Kline, P.; Saez, E. . (2014). Where is the land of Opportunity? The Geography of Intergenerational Mobility in the United States. The Quarterly Journal of Economics, 129(4), 1553–1623. doi:10.1093/qje/qju022 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research