@article{ref1,
title="American association of suicidology. presidental address: suicide assessment in the 1990's",
journal="Suicide and life-threatening behavior",
year="1991",
author="Yufit, R. I.",
volume="21",
number="2",
pages="152-163",
abstract="Abstract unavailable.",
language="",
issn="0363-0234",
doi="",
url="http://dx.doi.org/"
}