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Carl Erb; Ulrike Gast; Dieter Schremmer. (2008). German register for glaucoma patients with dry eye. I. Basic outcome with respect to dry eye. , 246(11), 1593–1601. doi:10.1007/s00417-008-0881-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research