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Oesch, Denis W.; Sanchez, Darryl J.; Tewksbury-Christle, Carolyn M. . (2012). Aggregate behavior of branch points - persistent pairs. Optics Express, 20(2), 1046–. doi:10.1364/OE.20.001046 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research