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Li, Khan W.; Haroun, Raymond I.; Clatterbuck, Richard E.; Murphy, Kieran; Rigamonti, Daniele . (2001). Superficial Siderosis Associated with Multiple Cavernous Malformations: Report of Three Cases. Neurosurgery, 48(5), 1147–1151. doi:10.1097/00006123-200105000-00039 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research