TY  - RPRT
TI  - Tracheostomy in obstetric practice?
AU  - C B Collier
PY  - 1989
DO  - 10.1111/j.1365-2044.1989.tb11302.x
UR  - https://pubmed.ncbi.nlm.nih.gov/2765020/
ID  - 2765020
ER  -