@article{ref1,
title="Monocular visual cues and space perception during the approach to landing",
journal="Aerospace medicine",
year="1974",
author="Riordan, R. H.",
volume="45",
number="7",
pages="766-771",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}