TY  - RPRT
TI  - Pulmonary function studies with simple equipment in 323 normal children.
AU  - M T Kopetzky
AU  - R Maselli
AU  - E F Ellis
PY  - 1974
DO  - 10.1016/0091-6749(74)90093-1
UR  - https://pubmed.ncbi.nlm.nih.gov/4808778/
ID  - 4808778
ER  -