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Witte, A.; Kisters, Th.; Riehle, F.; Helmcke, J.. (1992). Laser cooling and deflection of a calcium atomic beam. josab/9/7/josab-9-7-1030.pdf, 9(7), 1030–0. doi:10.1364/JOSAB.9.001030 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research