TY  - RPRT
TI  - Chronic obstructive pulmonary disease.
AU  - J Beech
PY  - 1991
DO  - 10.1016/s0749-0739(17)30517-5
UR  - https://pubmed.ncbi.nlm.nih.gov/2054711/
ID  - 2054711
ER  -