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Sung, Hong-Gye; Yeom, Hyo-Won; Yoon, Sangkyu; Kim, Seong-Jin; Kim, Jingon . (2010). Investigation of Rocket Exhaust Diffusers for Altitude Simulation. Journal of Propulsion and Power, 26(2), 240–247. doi:10.2514/1.46226 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research