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Lasierra, J.; Aza, M.J.; Viladés, E.; Poblet, S.; Barrao, F.; Bayon, E.; Gonzalez, J. . (1991). Tissue plasminogen activator and plasminogen activator inhibitor in patients with liver cirrhosis. Fibrinolysis, 5(2), 117–120. doi:10.1016/0268-9499(91)90053-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research