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Anders R Nakstad; Nils O Skaga; Johan Pillgram-Larsen; Berit Gran; Hans E Heier. (2011). Trends in transfusion of trauma victims - evaluation of changes in clinical practice. , 19(1), 23–0. doi:10.1186/1757-7241-19-23 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research