TY  - RPRT
TI  - Incompetent internal cervical os; case presentation.
AU  - R H BARTER
AU  - A F LASH
PY  - 1959
DO  - 10.1016/0002-9378(59)90380-1
UR  - https://pubmed.ncbi.nlm.nih.gov/13649812/
ID  - 13649812
ER  -