TY  - RPRT
TI  - A way to classify chronic obstructive pulmonary diseases.
AU  - I Kass
PY  - 1972
DO  - 10.1164/arrd.1972.106.4.622
UR  - https://pubmed.ncbi.nlm.nih.gov/5077784/
ID  - 5077784
ER  -