@article{ref1,
title="Guard-rails on bridges: necessity and sufficiency",
journal="Central law journal",
year="1918",
author="Cooper, H. O'b",
volume="86",
number="",
pages="279-279",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="",
doi="",
url="http://dx.doi.org/"
}