TY  - RPRT
TI  - Standardized perinatal mortality ratios: technique, utility and interpretation.
AU  - R Mallett
AU  - E G Knox
PY  - 1979
DO  - 10.1007/bf02548737
UR  - https://pubmed.ncbi.nlm.nih.gov/477295/
ID  - 477295
ER  -