@article{ref1,
title="Mortality in twins in relation to smoking habits and alcohol problems",
journal="Archives of environmental health",
year="1973",
author="Friberg, L. and Cederlöf, R. and Lorich, U. and Lundman, T. and de Faire, U.",
volume="27",
number="5",
pages="294-304",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-9896",
doi="",
url="http://dx.doi.org/"
}