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Q. Lu; C. Wang; J. Bai; K. Wang; W. Lian; S. Lou; X. Jiao; G. Yang. (2015). Subnanometer resolution displacement sensor based on a grating interferometric cavity with intensity compensation and phase modulation. , (), –. doi:10.1364/ao.54.004188 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research