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Sauter, Th.; Neuhauser, W.; Blatt, R.; Toschek, P. E. . (1986). Observation of Quantum Jumps. Physical Review Letters, 57(14), 1696–1698. doi:10.1103/physrevlett.57.1696 

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