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François Malecaze; Julien Coullet; Patrick Calvas; Pierre Fournié; Jean-Louis Arné; Christine Brodaty. (2006). Corneal Ectasia after Photorefractive Keratectomy for Low Myopia. , 113(5), 0–746. doi:10.1016/j.ophtha.2005.11.023 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research