@article{ref1,
title="Preliminary findings from a twin study of alcohol use",
journal="Progress in clinical and biological research",
year="1981",
author="Clifford, C. A. and Fulker, David W. and Gurling, H. M. and Murray, R. M.",
volume="69",
number="C",
pages="47-52",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0361-7742",
doi="",
url="http://dx.doi.org/"
}