@article{ref1,
title="The depression of widowhood after thirteen months",
journal="British journal of psychiatry",
year="1973",
author="Bornstein, P. E. and Clayton, Paula J. and Halikas, J. A. and Maurice, W. L. and Robins, E.",
volume="122",
number="570",
pages="561-566",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-1250",
doi="",
url="http://dx.doi.org/"
}