1. Report of the medical research council working party;Long;Lancet,1981
2. Nocturnal oxygen therapy trial group;Continuous;Ann Intern Med,1980
3. Long-term oxygen therapy;Jindal;Expert Rev Respir Med,2012
4. Long-term oxygen therapy prescription in India: Evaluation of compliance, factors affecting compliance, indications, and survival;Patro;Lung India,2022
5. Global initiative for the diagnosis, management, and prevention of chronic obstructive lung disease.The 2020 GOLD science committee report on COVID-19 and chronic obstructive pulmonary disease;Halpin;Am J Respir Crit Care Med,2021