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Heidi J. Featherstone; Jane Sansom. (2004). Feline corneal sequestra: a review of 64 cases (80 eyes) from 1993 to 2000. , 7(4), 213–227. doi:10.1111/j.1463-5224.2004.04028.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research