@article{ref1,
title="A psychophysical metric for visual space perception",
journal="Ergonomics",
year="1970",
author="Freeman, R. B. Jr",
volume="13",
number="1",
pages="73-81",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}