@article{ref1,
title="Helmets on climbers",
journal="Wilderness and environmental medicine",
year="1995",
author="Hultgren, H. N. and Fries, J. and Embick, A. and Frost, T.",
volume="6",
number="3",
pages="344; discussion 344-5",
abstract="Abstract unavailable.",
language="",
issn="1080-6032",
doi="",
url="http://dx.doi.org/"
}