TY  - GEN
AU  - Bernstein,M E
TI  - Variation of primary and secondary mammalian sex ratio
SN  - 0018-7143
PY  - 1990///0828
KW  - Abortion, Spontaneous
KW  - epidemiology
KW  - Animals
KW  - Female
KW  - Humans
KW  - Insemination, Artificial
KW  - Male
KW  - Pregnancy
KW  - Sex Ratio
KW  - Spermatozoa
KW  - analysis
N1  - Publication Type: Letter
ER  -