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Busin, M.; Scorcia, V.; Patel, A. K.; Salvalaio, G.; Ponzin, D. . (2011). Donor tissue preparation for Descemet membrane endothelial keratoplasty. British Journal of Ophthalmology, 95(8), 1172–1173. doi:10.1136/bjo.2010.195651 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research