TY  - RPRT
TI  - Interval between pregnancies.
AU  - J D Erickson
AU  - T Bjerkedal
PY  - 1979
DO  - 10.1016/s0140-6736(79)90502-6
UR  - https://pubmed.ncbi.nlm.nih.gov/83505/
ID  - 83505
ER  -