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Bevilacqua, Stefano; Matteucci, Sacha; Ferrarini, Matteo; Kacila, Mirsad; Ripoli, Andrea; Baroni, Alessandra; Mercogliano, Domenico; Glauber, Mattia; Ferrazzi, Paolo . (2002). Biochemical evaluation of vacuum-assisted venous drainage: a randomized, prospective study. Perfusion, 17(1), 57–61. doi:10.1191/0267659102pf525oa 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research