@article{ref1,
title="The Visual Perception of Size and Distance",
journal="Vision research",
year="1963",
author="Gogel, W. C.",
volume="3",
number="3-4",
pages="101-120",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0042-6989",
doi="",
url="http://dx.doi.org/"
}