TY  - RPRT
TI  - Variability of routine pulmonary function tests.
AU  - J Hruby
AU  - J Butler
PY  - 1975
DO  - 10.1136/thx.30.5.548
UR  - https://pubmed.ncbi.nlm.nih.gov/1198395/
ID  - 1198395
ER  -