@article{ref1,
title="Mental problems of aging",
journal="Offentliche Gesundheitswesen",
year="1973",
author="Rudolf, G. A.",
volume="35",
number="",
pages="Suppl 1:11-20",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0029-8573",
doi="",
url="http://dx.doi.org/"
}