@article{ref1,
title="Dynamic vision: the legibility of moderately spaced alphanumeric symbols",
journal="Human factors",
year="1965",
author="Lippert, S. and Lee, D. M.",
volume="7",
number="6",
pages="555-560",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}