@article{ref1,
title="Letter: Is the increase of the incidence of invalid pension due to the industrial society or the invalid insurance law?",
journal="Ugeskrift for Laeger",
year="1974",
author="Lund, M.",
volume="136",
number="7",
pages="385-387",
abstract="<p>[Abstract unavailable]</p><p>Language: da</p>",
language="da",
issn="0041-5782",
doi="",
url="http://dx.doi.org/"
}