@article{ref1,
title="Human Error: The Principal Cause of Skydiving Fatalities",
journal="Journal of human performance in extreme environments",
year="2003",
author="Hart, Carl L. and Griffith, James D.",
volume="7",
number="2",
pages="7-9",
abstract="Abstract unavailable.",
language="",
issn="1529-5168",
doi="",
url="http://dx.doi.org/"
}