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Aota, Tatsuya; Tomie, Toshihisa . (2005). Ultimate Efficiency of Extreme Ultraviolet Radiation from a Laser-Produced Plasma. Physical Review Letters, 94(1), 015004–. doi:10.1103/PhysRevLett.94.015004 

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