TY  - JOUR
A1  - Chen, R.
A1  - Morgan, S. P.
T1  - Recent trends in the timing of first births in the United States
Y1  - 1991
DO  - 10.2307/2061420
JF  - Demography
VL  - 28
IS  - 4
SP  - 513
EP  - -533

ER  -