TY  - RPRT
TI  - Towards easier childbirth.
AU  - P A Walker
AU  - R H Martin
AU  - J Higginbottom
PY  - 1972
DO  - 10.1016/s0140-6736(72)91750-3
UR  - https://pubmed.ncbi.nlm.nih.gov/4114732/
ID  - 4114732
ER  -