TY  - RPRT
TI  - Chronic bronchitis: some clinical, pathologic, and bacteriologic aspects.
AU  - N OSWALD
PY  - 1957
DO  - 10.1164/artpd.1957.75.2.340
UR  - https://pubmed.ncbi.nlm.nih.gov/13403164/
ID  - 13403164
ER  -