@article{ref1,
title="Preventive fire protection for underground trains operated by the Hamburger Hochbahn AG",
journal="Fire safety journal",
year="1984",
author="Albert, H.",
volume="8",
number="1",
pages="63-71",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0379-7112",
doi="",
url="http://dx.doi.org/"
}