TY  - RPRT
TI  - Factors affecting normal expectancy of conception.
AU  - A F GUTTMACHER
PY  - 1956
DO  - 10.1001/jama.1956.02970090081016
UR  - https://pubmed.ncbi.nlm.nih.gov/13319020/
ID  - 13319020
ER  -