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Heiberg, Johan; Asschenfeldt, Benjamin; Maagaard, Marie; Ringgaard, Steffen . (2017). Dynamic bicycle exercise to assess cardiac output at multiple exercise levels during magnetic resonance imaging. Clinical Imaging, 46(), 102–107. doi:10.1016/j.clinimag.2017.07.010 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research