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Prokisch, Holger; Hartig, Monika; Hellinger, Rosa; Meitinger, Thomas; Rosenberg, Thomas . (2007). A Population-Based Epidemiological and Genetic Study of X-Linked Retinitis Pigmentosa. Investigative Opthalmology & Visual Science, 48(9), 4012–. doi:10.1167/iovs.07-0071 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research