@article{ref1,
title="Catastrophe theory and law",
journal="Mathematical modelling",
year="1980",
author="Keown, R.",
volume="1",
number="4",
pages="319-329",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0270-0255",
doi="10.1016/0270-0255(80)90042-1",
url="http://dx.doi.org/10.1016/0270-0255(80)90042-1"
}