@article{Levels2012,
author = {Levels, M. and Need, A. and Nieuwenhuis, R. and Sluiter, R. and Ultee, W.},
title= {Unintended pregnancy and induced abortion in the Netherlands 1954–2002},
year = {2012},
doi = {10.1093/esr/jcq065},
volume = {28},
number = {3},
pages = {301--318},
}