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Patel, Smita; Kazerooni, Ella A.; Cascade, Philip N. . (2003). Pulmonary Embolism: Optimization of Small Pulmonary Artery Visualization at Multi–Detector Row CT1. Radiology, 227(2), 455–460. doi:10.1148/radiol.2272011139 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research