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De Somer, F; De Wachter, D; Verdonck, P; Van Nooten, G; Ebels, T . (2002). Evaluation of different paediatric venous cannulae using gravity drainage and VAVD: an <I>in vitro</I> study. Perfusion, 17(5), 321–326. doi:10.1191/0267659102pf593oa 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research