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Genes, C.; Ritsch, H.; Vitali, D. . (2009). Micromechanical oscillator ground-state cooling via resonant intracavity optical gain or absorption. Physical Review A, 80(6), 061803–. doi:10.1103/PhysRevA.80.061803 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research