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Lee, D.; Armaghani, S.; Archer, K. R.; Bible, J.; Shau, D.; Kay, H.; Zhang, C.; McGirt, M. J.; Devin, C. . (2014). Preoperative Opioid Use as a Predictor of Adverse Postoperative Self-Reported Outcomes in Patients Undergoing Spine Surgery. The Journal of Bone & Joint Surgery, 96(11), e89–e89. doi:10.2106/JBJS.M.00865 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research