@article{ref1,
title="A predictive scale of aircraft emergencies",
journal="Human factors",
year="1968",
author="Edelman, David A. and Rigby, L. V.",
volume="10",
number="5",
pages="475-482",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}