TY  - GEN
AU  - Bernstein,M E
TI  - Secondary sex-ratio variation
SN  - 0002-9297
PY  - 1986///0721
KW  - Female
KW  - Humans
KW  - Infant, Newborn
KW  - Male
KW  - Paternal Age
KW  - Sex Ratio
N1  - Publication Type: Letter
ER  -