@article{ref1,
title="The relationship between retinal disparity and relative visual distance",
journal="Vision research",
year="1968",
author="Shipley, T. and Williams, D.",
volume="8",
number="3",
pages="325-332",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0042-6989",
doi="",
url="http://dx.doi.org/"
}