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John Schlechter; Peter Newton; Vidyadhar Upasani; Burt Yaszay; Lawrence Lenke; Randal Betz; Thomas Lowe. (2008). P130. Risk Factors for Distal Adding-on Identified: What to Watch Out For. , 8(5-supp-S), 164–. doi:10.1016/j.spinee.2008.06.772 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research