TY  - JOUR
A1  - Darroch, J.E.
A1  - Sing, S.
A1  - Frost, J.J. 
T1  - Differences in teenage pregnancy rates among five developed countries: the roles of sexual activity and contraceptive use
Y1  - 2001
DO  - 10.2307/3030191
JF  - Family Planning Perspectives 
VL  - 33
SP  - 244
EP  - -250

ER  -