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Dahmani, B.; Hollberg, L.; Drullinger, R.. (1987). Frequency stabilization of semiconductor lasers by resonant optical feedback. ol/12/11/ol-12-11-876.pdf, 12(11), 876–0. doi:10.1364/OL.12.000876 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research