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Khoo, I. C.. (2011). Extreme nonlinear optics of nematic liquid crystals [Invited]. josab/28/12/josab-28-12-A45.pdf, 28(12), 0–0. doi:10.1364/JOSAB.28.000A45 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research