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FAIRLEY, H. B.; BRITT, B. A. . (1965). THE ADEQUACY OF THE AIR-MIX CONTROL IN VENTILATORS OPERATED FROM AN OXYGEN SOURCE. Survey of Anesthesiology, 9(6), 589–. doi:10.1097/00132586-196512000-00032 
10.1097/00132586-196512000-00032