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Geibel, Paul T.; Boyd, Daniel L.; Slabisak, Vudhi . (2009). The Use of Recombinant Human Bone Morphogenic Protein in Posterior Interbody Fusions of the Lumbar Spine. Journal of Spinal Disorders & Techniques, 22(5), 315–320. doi:10.1097/bsd.0b013e31817d8161 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research