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Chaffee, Bruce; Donaghy, R. M. Peardon . (1963). Meningioma of the Fourth Ventricle*. Journal of Neurosurgery, 20(6), 520–522. doi:10.3171/jns.1963.20.6.0520 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research