@article{ref1,
title="Required vision testing for older drivers",
journal="New England journal of medicine",
year="1992",
author="Nelson, David E. and Sacks, Jeffrey J. and Chorba, T. L.",
volume="326",
number="26",
pages="1784-1785",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0028-4793",
doi="",
url="http://dx.doi.org/"
}