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Schwer, Douglas; Kailasanath, K. . (2013). Fluid dynamics of rotating detonation engines with hydrogen and hydrocarbon fuels. Proceedings of the Combustion Institute, 34(2), 1991–1998. doi:10.1016/j.proci.2012.05.046 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research