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Singh, R. S.; Singh, H.; Sharma, V.; Mahajan, S. . (2008). Disconnection of the tip of the aortic cannula during cardiopulmonary bypass. Interactive CardioVascular and Thoracic Surgery, 8(2), 250–251. doi:10.1510/icvts.2008.178962 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research