@article{ref1,
title="Sphere and cylinder distribution among the USAF rated population requiring spectacles",
journal="Aviation, space, and environmental medicine",
year="1984",
author="Provines, W. F. and Woessner, W. M. and Tredici, T. J. and Rahe, A. J.",
volume="55",
number="8",
pages="751-753",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-6562",
doi="",
url="http://dx.doi.org/"
}