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De Antoni, Daniel Julio; Claro, Maria Laura; Poehling, Gary G.; Hughes, Steven S. . (1996). Translaminar lumbar epidural endoscopy: Anatomy, technique, and indications. Arthroscopy: The Journal of Arthroscopic & Related Surgery, 12(3), 330–334. doi:10.1016/S0749-8063(96)90069-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research