1. Domiciliary oxygen therapy services: clinical guidelines and advice for prescribers; a report of the Royal College of Physicians June 1999
2. Ambulatory oxygen for chronic obstructive pulmonary disease;Ram;Cochrane Database Syst Rev,2002
3. Ambulatory and training oxygen: a review of the evidence and guidelines for prescription;Young;N Z J Physiother,2005
4. Short-term ambulatory oxygen for chronic obstructive pulmonary disease;Bradley;Cochrane Database Syst Rev,2005