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Barluenga, Marta; Stölting, Kai N.; Salzburger, Walter; Muschick, Moritz; Meyer, Axel. (2006). Sympatric speciation in Nicaraguan crater lake cichlid fish. , 439(7077), 719–723. doi:10.1038/nature04325 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research