@article{ref1,
title="Two approaches to a non-accident measure for continuous assessment of safety performance",
journal="Journal of safety research",
year="1970",
author="Rockwell, T. H. and Bhise, VD",
volume="2",
number="3",
pages="176-187",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0022-4375",
doi="",
url="http://dx.doi.org/"
}