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M. Isabel Fiel; Kemal Deniz; Ferhan Elmali; Thomas D. Schiano. (2011). Increasing hepatic arteriole wall thickness and decreased luminal diameter occur with increasing age in normal livers. , 55(3), 0–586. doi:10.1016/j.jhep.2010.12.018 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research