@article{ref1,
title="Environmental factors preceding the onset of severe depressions",
journal="Psychiatry interpersonal and biological processes",
year="1970",
author="Leff, M. J. and Roatch, J. F. and Bunney, W. E. Jr",
volume="33",
number="3",
pages="293-311",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-2747",
doi="",
url="http://dx.doi.org/"
}