@article{ref1,
title="Minimal requirements of vision in lifeguards",
journal="Offentliche Gesundheitswesen",
year="1984",
author="Gramberg-Danielsen, B.",
volume="46",
number="12",
pages="600-602",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0029-8573",
doi="",
url="http://dx.doi.org/"
}