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Gordeyev, Stanislav; Hayden, Tim E.; Jumper, Eric J. . (2007). Aero-Optical and Flow Measurements Over a Flat-Windowed Turret. AIAA Journal, 45(2), 347–357. doi:10.2514/1.24468 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research