@article{Trussell1999,
author = {Trussell, J. and Vaughan, B. and Stanford, J.},
title= {Are all contraceptive failures unintended pregnancies? Evidence from the 1995 National Survey of Family Growth},
year = {1999},
journal = {Family Planning Perspectives},
volume = {31},
number = {5},
pages = {246--247 & 260},
}