TY  - RPRT
TI  - D.Obst.R.C.O.G.
AU  - B Heber
AU  - C J Cummins
PY  - 1971
DO  - 10.5694/j.1326-5377.1971.tb87641.x
UR  - https://pubmed.ncbi.nlm.nih.gov/5552425/
ID  - 5552425
ER  -