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P. W. Moxey; P. Gogalniceanu; R. J. Hinchliffe; I. M. Loftus; K. J. Jones; M. M. Thompson; P. J. Holt. (2011). Lower extremity amputations — a review of global variability in incidence. , 28(10), 1144–1153. doi:10.1111/j.1464-5491.2011.03279.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research