@article{ref1,
title="Firesafety symbols for worldwide communications",
journal="Fire journal",
year="1979",
author="Quakkelaar, A. J.",
volume="73",
number="4",
pages="45-47",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0015-2617",
doi="",
url="http://dx.doi.org/"
}