@article{ref1,
title="A standardized ratio for measuring the "suddenness" of events with applications to the four leading causes of violent death and to certain birth defects",
journal="Social biology",
year="1980",
author="Grimson, R. C.",
volume="27",
number="4",
pages="286-293",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0037-766X",
doi="",
url="http://dx.doi.org/"
}