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Esteve, Albert; Schwartz, Christine R.; van Bavel, Jan; Permanyer, Iñaki; Klesment, Martin; García-Román, Joan . (2016). The End of Hypergamy: Global Trends and Implications. Population and Development Review, (), –. doi:10.1111/padr.12012 

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