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Anchordoqui, Luis A.; Feng, Wan-Zhe; Goldberg, Haim; Huang, Xing; Taylor, Tomasz R. . (2011). collisions. Physical Review D, 83(10), 106006–. doi:10.1103/PhysRevD.83.106006 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research