TY  - RPRT
TI  - Pushing techniques during labor: issues and controversies.
AU  - L Petersen
AU  - P Besuner
DO  - 10.1111/j.1552-6909.1997.tb02747.x
UR  - https://pubmed.ncbi.nlm.nih.gov/9395981/
ID  - 9395981
ER  -