@article{ref1,
title="Manic-depressive illness. A clinical, social and genetic study",
journal="Acta psychiatrica Scandinavica. Supplementum",
year="1977",
author="Petterson, U.",
volume="",
number="269",
pages="1-93",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0065-1591",
doi="",
url="http://dx.doi.org/"
}