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Escobar, C.; Divisón, J.A.; Seguí, M. . (2015). Seguridad cardiovascular de los inhibidores DPP4. SEMERGEN - Medicina de Familia, (), S1138359315002452–. doi:10.1016/j.semerg.2015.06.003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research