@article{ref1,
title="Just how many accidents are caused by bad road signs?",
journal="Applied ergonomics",
year="1976",
author="Smith, Gordon C. S.",
volume="7",
number="3",
pages="157-158",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0003-6870",
doi="",
url="http://dx.doi.org/"
}