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Thaulow, Erik; Frøysaker, Tor; Dale, Jon; Vatne, Karleif . (1987). Failure of combined acetylsalicylic acid and dipyridamole to prevent occlusion of aortocoronary venous bypass graft. Scandinavian Cardiovascular Journal, 21(3), 215–220. doi:10.3109/14017438709106027 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research