TY  - RPRT
TI  - Multipurpose breathing systems.
AU  - D Humphrey
PY  - 1987
DO  - 10.1111/j.1365-2044.1987.tb02972.x
UR  - https://pubmed.ncbi.nlm.nih.gov/3469922/
ID  - 3469922
ER  -