@article{ref1,
title="Ground hazard indicators",
journal="Canadian hospital",
year="1973",
author="Graystone, P.",
volume="50",
number="2",
pages="46-51",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0008-3798",
doi="",
url="http://dx.doi.org/"
}