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Heyland, Daren K.; Cahill, Naomi; Day, Andrew G. . (2011). Optimal amount of calories for critically ill patients: Depends on how you slice the cake!*. Critical Care Medicine, 39(12), 2619–2626. doi:10.1097/ccm.0b013e318226641d 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research