TY  - RPRT
TI  - Comparative spirometry measurements using a bellows-type and a water-sealed spirometer.
AU  - J W Ledwith
PY  - 1967
DO  - 10.1164/arrd.1967.95.3.512
UR  - https://pubmed.ncbi.nlm.nih.gov/6018712/
ID  - 6018712
ER  -