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2. Comparison of liquid and gaseous oxygen for domiciliary portable use;Lock, S.H.; Blowe, G.; Prynne, M.; Wedzicha, J.A.;Thorax,1992
3. Efficacy of pulsed oxygen delivery during exercise;McDonnell, T.J.; Wanger, J.S.; Senn, S.; Cherniak, R.M.;Respir Care,1986
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