TY  - RPRT
TI  - Helium/oxygen and severe COPD.
AU  - A H Morice
PY  - 2000
DO  - 10.1016/s0140-6736(00)03226-8
UR  - https://pubmed.ncbi.nlm.nih.gov/11117906/
ID  - 11117906
ER  -