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Edward Wylegala; Dorota Tarnawska. (2006). Amniotic Membrane Transplantation with Cauterization for Keratoconus Complicated by Persistent Hydrops in Mentally Retarded Patients. , 113(4), 0–564. doi:10.1016/j.ophtha.2005.12.015 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research