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Viviene Cucevic; Anne MV Brooks; Nicole T. Strang; Anthony G. Klein; Keith A. Nugent. (1997). Use of a confocal laser scanning ophthalmoscope to detect glaucomatous cupping of the optic disc. , 25(Supplement S1), 217–220. doi:10.1111/j.1442-9071.1997.tb01395.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research