@article{ref1,
title="Suicide clusters: a critical review",
journal="Suicide and life-threatening behavior",
year="1989",
author="Davidson, L. and Wallenstein, S. and Gould, Madelyn S.",
volume="19",
number="1",
pages="17-29",
abstract="Abstract unavailable.",
language="",
issn="0363-0234",
doi="",
url="http://dx.doi.org/"
}