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Kertes, Peter J.; Wafapoor, Hussein; Peyman, Gholam A.; Calixto, Nassim; Thompson, Hilary . (1997). The Management of Giant Retinal Tears Using Perfluoroperhydrophenanthrene. Ophthalmology, 104(7), 1159–1165. doi:10.1016/S0161-6420(97)30168-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research