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Cogo, P. E.; Facco, M.; Simonato, M.; Verlato, G.; Rondina, C.; Baritussio, A.; Toffolo, G. M.; Carnielli, V. P. . (2009). Dosing of Porcine Surfactant: Effect on Kinetics and Gas Exchange in Respiratory Distress Syndrome. PEDIATRICS, 124(5), e950–e957. doi:10.1542/peds.2009-0126 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research