PT - JOURNAL ARTICLE AU - Palange, P. TI - Lighter than air: heliox breathing improves exercise tolerance in COPD AID - 10.1183/09059180.00000210 DP - 2010 Mar 01 TA - European Respiratory Review PG - 1--3 VI - 19 IP - 115 4099 - https://publications.ersnet.org//content/19/115/1.short 4100 - https://publications.ersnet.org//content/19/115/1.full SO - EUROPEAN RESPIRATORY REVIEW2010 Mar 01; 19