TY  - RPRT
TI  - Difference between postpartum and nutritional amenorrhea.
AU  - R E Frisch
AU  - J W McArthur
PY  - 1979
DO  - 10.1126/science.203.4383.921-a
UR  - https://pubmed.ncbi.nlm.nih.gov/419411/
ID  - 419411
ER  -