@article{ref1,
title="Mood disorders and bereavement in late life",
journal="Current opinion in psychiatry",
year="1993",
author="Zisook, S. and Peterkin, J.J.",
volume="6",
number="4",
pages="568-573",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0951-7367",
doi="10.1097/00001504-199308000-00020",
url="http://dx.doi.org/10.1097/00001504-199308000-00020"
}