TY  - RPRT
TI  - Chronic obstructive pulmonary disease.
AU  - P M Penna
PY  - 1973
DO  - 10.1016/s0003-0465(16)32824-5
UR  - https://pubmed.ncbi.nlm.nih.gov/4759578/
ID  - 4759578
ER  -