5Medical Research Council WorkingParry. Long term domiciliary oxygentherapy in chronic hypoxic cor pul-monale compling chronic bronchiticsand emphysema [ J]. Lancet, 1981,1(8222) :681-685.
6Nocturnal Oxygen Therapy TrailGroup. Continuous or nocturnaloxygen therapy therapy in hypoxemicchronic obstructive lung disease : aclinical trial [ J ]. Ann Intern Med,1980,93(3) :391-398.
10Orth M, Walther JW, Yalzin S, etal. Influence of nocturnal oxygentherapy on quality of life in patientswith COPD and isolated sleep-relatedhypoxemia : a prospective, placebo-controlled cross-over trial [ J ] . Pneu-mologie, 2008, 62(1) :11-16.
7Agarwal R* Jindal SK. Long - term oxygen therapy[M]//JindalSK, Agarwal R. Oxygen Therapy. New Delhi: India Jaypee Publi-cations, 2008^: 193-210.
8Katserios S,Charisis A,Daskalopoulos G,et al. Long - term oxy-geti ^ttieVapy in chronic obstructive pulmonary disease: The use ofconcentrators and liquid oxygen systems in north - western Greece[J]. Respiration,2006,73(6):777 - 782.