TY  - RPRT
TI  - Notes on respiratory performance during labour.
AU  - J S Crawford
AU  - M E Tunstall
PY  - 1968
DO  - 10.1093/bja/40.8.612
UR  - https://pubmed.ncbi.nlm.nih.gov/5667306/
ID  - 5667306
ER  -