TY  - RPRT
TI  - Normal labor: mechanism and duration.
AU  - John B Liao
AU  - Catalin S Buhimschi
AU  - Errol R Norwitz
PY  - 2005
DO  - 10.1016/j.ogc.2005.01.001
UR  - https://pubmed.ncbi.nlm.nih.gov/15899352/
ID  - 15899352
ER  -