@article{ref1,
title="Radiation exposure during air and ground transportation",
journal="Health physics",
year="1976",
author="Hsu, P. C. and Weng, P. S.",
volume="31",
number="6",
pages="522-524",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0017-9078",
doi="",
url="http://dx.doi.org/"
}