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Lefebvre, A.; Dano, B.; Bartow, W. B.; Fronzo, M. D.; Zha, G. C. . (2016). Performance and Energy Expenditure of Coflow Jet Airfoil with Variation of Mach Number. Journal of Aircraft, (), 1–11. doi:10.2514/1.C033113 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research