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Stefanie Schuman; Adam H. Rogers; Jay S. Duker; Elias Reichel; Caroline R. Baumal. (2006). Six-Week Outcomes after Pegaptanib. , 113(3), 1–. doi:10.1016/j.ophtha.2005.12.016 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research