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13. A new valve for controlled respiration anaesthesia. RYAN AR Br J Anaesth; 1955 Feb; 27(2):102-4. PubMed ID: 13230369 [No Abstract] [Full Text] [Related]
14. Pressure-flowrate characteristics of expiratory valves with some suggested criteria for an ideal valve. MUSHIN WW; MAPLESON WW Br J Anaesth; 1954 Jan; 26(1):3-11. PubMed ID: 13126367 [No Abstract] [Full Text] [Related]