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He, Yong; Hu, Xiwei; Hu, Yemin; Jiang, Zhonghe; Lü, Jianhong . (2006). Rankine-Hugoniot relations of an axial shock in cylindrical non-neutral plasma. Physics of Plasmas, 13(9), 092116–. doi:10.1063/1.2355661 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research