@article{ref1,
title="US Air Force permissible exposure levels for laser irradiation",
journal="Archives of environmental health",
year="1970",
author="Carpenter, J. A. and Lehmiller, D. J. and Tredici, T. J.",
volume="20",
number="2",
pages="171-176",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-9896",
doi="",
url="http://dx.doi.org/"
}