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Talluri, L.; Nalianda, D.K.; Giuliani, E. . (2018). Techno economic and environmental assessment of Flettner rotors for marine propulsion. Ocean Engineering, 154(), 1–15. doi:10.1016/j.oceaneng.2018.02.020 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research