@article{ref1,
title="Incidence of occupational knee joint diseases in elderly pipe-fitters in the ship-building industry",
journal="Beitrage zur Orthopadie und Traumatologie",
year="1986",
author="Nauwald, G.",
volume="33",
number="3",
pages="124-128",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0005-8149",
doi="",
url="http://dx.doi.org/"
}