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Boll, Martin; Corduan, Matthias; Biser, Stefan; Filipenko, Mykhaylo; Pham, Quoc Huang; Schlachter, Sonja; Rostek, Peter; Noe, Mathias . (2020). A holistic system approach for short range passenger aircraft with cryogenic propulsion system. Superconductor Science and Technology, 33(4), 044014–. doi:10.1088/1361-6668/ab7779 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research