@article{ref1,
title="Re: "Use of census-based aggregate variables to proxy for socioeconomic group: evidence from national samples"",
journal="American journal of epidemiology",
year="1999",
author="Gordon, D. and Krieger, N.",
volume="150",
number="8",
pages="892-896",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9262",
doi="",
url="http://dx.doi.org/"
}