@article{ref1,
title="Some observations of the behavior of a visual target and a visual afterimage during parabolic flight maneuvers",
journal="Aerospace medicine",
year="1963",
author="Roman, J. A. and Warren, B. H. and Niven, J. I. and Graybiel, A.",
volume="34",
number="",
pages="841-846",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}