@article{ref1,
title="Some visual problems of flight",
journal="American journal of optometry and archives of American Academy of Optometry",
year="1957",
author="Arner, R. S.",
volume="34",
number="5",
pages="233-240",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9408",
doi="",
url="http://dx.doi.org/"
}