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Stanley, R. P.; Houdré, R.; Weisbuch, C.; Oesterle, U.; Ilegems, M. . (1996). Cavity-polariton photoluminescence in semiconductor microcavities: Experimental evidence. Physical Review B, 53(16), 10995–11007. doi:10.1103/PhysRevB.53.10995 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research