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J. S. Nix; R. T. Fitzgerald; R. S. Samant; M. Harrison; E. J. Angtuaco. (2014). Spinal bone marrow necrosis with vertebral compression fracture: differentiation of BMN from AVN. , 43(9), 1337–1340. doi:10.1007/s00256-014-1906-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research