@article{Darroch2001,
author = {Darroch, J.E. and Sing, S. and Frost, J.J. },
title= {Differences in teenage pregnancy rates among five developed countries: the roles of sexual activity and contraceptive use},
year = {2001},
doi = {10.2307/3030191},
journal = {Family Planning Perspectives },
volume = {33},
pages = {244--250},
}