TY  - RPRT
TI  - FIVE YEARS' EXPERIENCE WITH THE VACUUM EXTRACTOR.
AU  - J A CHALMERS
PY  - 1964
DO  - 10.1136/bmj.1.5392.1216
UR  - https://pubmed.ncbi.nlm.nih.gov/14120829/
ID  - 14120829
ER  -