@article{ref1,
title="Fall of a wall-bracket crane",
journal="Zentralblatt fur Arbeitsmedizin und Arbeitsschutz",
year="1953",
author="Heisig, A.",
volume="3",
number="6",
pages="173-175",
abstract="<p>[Abstract unavailable]</p><p>Language: un</p>",
language="un",
issn="0044-4049",
doi="",
url="http://dx.doi.org/"
}