@article{ref1,
title="An ergonomic evaluation of trail workers at Yosemite National Park",
journal="Applied occupational and environmental hygiene",
year="1999",
author="Habes, D. and Schiefer, M.",
volume="14",
number="5",
pages="276-284",
abstract="Abstract unavailable.",
language="",
issn="1047-322X",
doi="",
url="http://dx.doi.org/"
}