TY  - RPRT
TI  - [CHANGES IN THE BIRTH AND CONCEPTION FREQUENCY DURING CHANGING TIMES].
AU  - W MAIER
PY  - 1964
DO  - 10.1007/bf00673196
UR  - https://pubmed.ncbi.nlm.nih.gov/14339626/
ID  - 14339626
ER  -