@article{ref1,
title="Judgments of relative distance based on separate 2-D TV views",
journal="Human factors",
year="1967",
author="Crawford, B. M. and Kama, W. N.",
volume="9",
number="5",
pages="447-454",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}