@article{ref1,
title="Diagnostic criteria for grading the severity of acute motion sickness",
journal="Aerospace medicine",
year="1968",
author="Graybiel, A. and Wood, C. D. and Miller, E. F. and Cramer, D. B.",
volume="39",
number="5",
pages="453-455",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}