@article{ref1,
title="Improving population estimates with the use of dummy variables",
journal="Demography",
year="1970",
author="Pursell, D. E.",
volume="7",
number="1",
pages="87-91",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0070-3370",
doi="",
url="http://dx.doi.org/"
}