TY  - RPRT
TI  - Respiratory muscle function, assessment, and training.
AU  - T H Shaffer
AU  - M R Wolfson
AU  - V K Bhutani
PY  - 1981
DO  - 10.1093/ptj/61.12.1711
UR  - https://pubmed.ncbi.nlm.nih.gov/7312944/
ID  - 7312944
ER  -