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Huang, Huateng; Rabosky, Daniel L. . (2014). Sexual Selection and Diversification: Reexamining the Correlation between Dichromatism and Speciation Rate in Birds. The American Naturalist, 184(5), E101–E114. doi:10.1086/678054 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research