@article{ref1,
title="Vision screening for motor vehicle operators",
journal="Indiana medicine",
year="1988",
author="Cecil, J. D. and Helveston, E. M.",
volume="81",
number="4",
pages="307-310",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0746-8288",
doi="",
url="http://dx.doi.org/"
}