TY  - RPRT
TI  - Long-term performance of a hand held spirometer.
AU  - A Dirksen
AU  - F Madsen
AU  - O F Pedersen
AU  - A M Vedel
AU  - A Kok-Jensen
PY  - 1996
DO  - 10.1136/thx.51.10.973
UR  - https://pubmed.ncbi.nlm.nih.gov/8977594/
ID  - 8977594
ER  -