@article{ref1,
title="Medical hazards to cave explorers",
journal="GP",
year="1958",
author="Halliday, W. R.",
volume="18",
number="1",
pages="80-83",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0016-3600",
doi="",
url="http://dx.doi.org/"
}