TY  - RPRT
TI  - Beta-endorphin and parturition.
AU  - J E Fletcher
AU  - T A Thomas
AU  - R G Hill
PY  - 1980
DO  - 10.1016/s0140-6736(80)90803-x
UR  - https://pubmed.ncbi.nlm.nih.gov/6101760/
ID  - 6101760
ER  -