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Schellong, Sebastian M.; Böger, Rainer H.; Burchert, Wolfgang; Bode-Böger, Stefanie M.; Galland, Andrea; Frölich, Jürgen C.; Hundeshagen, Heinz; Alexander, Klaus . (1997). Dose-Related Effect of Intravenous l-Arginine on Muscular Blood Flow of the Calf in Patients with Peripheral Vascular Disease: A H <sub/>2</sub><sup>15</sup> O Positron Emission Tomography Study. Clinical Science, 93(2), 159–165. doi:10.1042/cs0930159 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research