TY  - RPRT
TI  - A variable pattern respirator with phased sampling device.
AU  - J CLUTTON-BROCK
PY  - 1957
DO  - 10.1093/bja/29.11.517
UR  - https://pubmed.ncbi.nlm.nih.gov/13489111/
ID  - 13489111
ER  -