@article{ref1,
title="A comparison of methods for the evaluation of protective headgear",
journal="Aerospace medicine",
year="1964",
author="Roberts, J. B. and Hygh, E. H.",
volume="35",
number="",
pages="1044-1047",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}