@article{ref1,
title="Visual accommodation and virtual image displays: target detection and recognition",
journal="Human factors",
year="1986",
author="Norman, J. and Ehrlich, Stefan",
volume="28",
number="2",
pages="135-151",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}