@article{Kaufmann1997,
author = {Kaufmann, R.B. and Morris, L. and Spitz, A.M.},
title= {Comparison of two question sequences for assessing pregnancy intentions},
year = {1997},
URL = {http://aje.oxfordjournals.org/cgi/content/abstract/145/9/810 },
journal = {American Journal of Epidemiology},
volume = {145},
number = {9},
pages = {810--816},
}