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Ankur Gupta; Bharat Dave; Ankur Nanda; Hitesh Modi. (2009). Concomitant noncontiguous level (thoracic & lumbar) spinal stenosis. , 33(2), 483–488. doi:10.1007/s00264-008-0545-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research