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Jing Xu; Jeffrey J. Heys; Victor H. Barocas; Theodore W. Randolph. (2000). Permeability and Diffusion in Vitreous Humor: Implications for Drug Delivery. , 17(6), 664–669. doi:10.1023/a:1007517912927 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research