TY  - JOUR
A1  - Frost, J.J.
A1  - Singh, S.
A1  - Finer, L.B.
T1  - Factors associated with contraceptive use and nonuse, United States, 2004
Y1  - 2007
DO  - 10.1363/3909007
VL  - 39
IS  - 2

ER  -