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McVey, Jennifer; Petrie, David A.; Tallon, John M. . (2010). Air Versus Ground Transport of the Major Trauma Patient: A Natural Experiment. Prehospital Emergency Care, 14(1), 45–50. doi:10.3109/10903120903349788 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research