@article{ref1,
title="Suicide in Twins - A Historical Note",
journal="Journal of nervous and mental disease",
year="1941",
author="Loewenberg, R. D.",
volume="93",
number="",
pages="182-184",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0022-3018",
doi="",
url="http://dx.doi.org/"
}