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Chu, R.; Hua, X.; Mehringer, R.; Suni, P.; Kanefsky, M.; Falk, J.. (1992). A statistical description of stimulated Brillouin scattering beam combination efficiency. , 28(6), 0–1593. doi:10.1109/3.135312 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research