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Schnatz, H.; Lipphardt, B.; Helmcke, J.; Riehle, F.; Zinner, G. . (1996). First Phase-Coherent Frequency Measurement of Visible Radiation. Physical Review Letters, 76(1), 18–21. doi:10.1103/PhysRevLett.76.18 

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