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Feldman, Frieda; Hecht, Harvey L.; Johnsto, Austin D. . (1970). Chondromyxoid Fibroma of Bone <sup>1</sup>. Radiology, 94(2), 249–260. doi:10.1148/94.2.249 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research