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Dierckx, Riet; Goethals, Marc; Vanderheyden, Marc . (2013). Continuous invasive hemodynamic monitoring with an implantable device during biventricular mechanical support. The Journal of Heart and Lung Transplantation, 32(3), 375–376. doi:10.1016/j.healun.2012.11.024 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research