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Peli, Eli; Siegmund, Walter P. (1995). Fiber-optic reading magnifiers for the visually impaired. josaa/12/10/josaa-12-10-2274.pdf, 12(10), 2274–0. doi:10.1364/JOSAA.12.002274 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research