@article{ref1,
title="Covariation of suicides and undetermined deaths among elderly persons: a methodological study",
journal="Crisis",
year="1991",
author="Schmidtke, Armin and Weinacker, B.",
volume="12",
number="2",
pages="44-58",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0227-5910",
doi="",
url="http://dx.doi.org/"
}