TY  - RPRT
TI  - Problems associated with the rhythm method of contraception.
AU  - E Eichner
PY  - 1972
DO  - 10.1016/0002-9378(72)90582-0
UR  - https://pubmed.ncbi.nlm.nih.gov/4635732/
ID  - 4635732
ER  -