@article{ref1,
title="Drinking in Iowa. IV. Pre-occupation with alcohol and definitions of alcohol, heavy drinking and trouble due to drinking",
journal="Quarterly journal of studies on alcohol",
year="1960",
author="Mulford, H. A. and Miller, D. E.",
volume="21",
number="",
pages="279-291",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-5649",
doi="",
url="http://dx.doi.org/"
}