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L.E. Smeele; J.E. van der Wal; P.J. van Diest; I. van der Waal; G.B. Snow. (1994). Radical surgical treatment in craniofacial osteosarcoma gives excellent survival. A retrospective cohort study of 14 patients. , 30(6), 0–376. doi:10.1016/0964-1955(94)90014-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research