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Igal Leibovitch; Raman Malhotra; Dinesh Selva. (2006). Hard Palate and Free Tarsal Grafts as Posterior Lamella Substitutes in Upper Lid Surgery. , 113(3), 0–496. doi:10.1016/j.ophtha.2005.11.017 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research