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Ludolph, Albert C.; Brettschneider, Johannes; Weishaupt, Jochen H. . (2012). Amyotrophic lateral sclerosis. Current Opinion in Neurology, 25(5), 530–535. doi:10.1097/WCO.0b013e328356d328 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research