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D'Souza, M. J. J.; Chaudhary, V.; Devenyi, R.; Kertes, P. J.; Lam, W.-C. . (2011). Re-operation of idiopathic full-thickness macular holes after initial surgery with internal limiting membrane peel. British Journal of Ophthalmology, 95(11), 1564–1567. doi:10.1136/bjo.2010.195826 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research