@article{ref1,
title="Coloured lenses and car driving",
journal="Acta ophthalmologica (Copenhagen)",
year="1971",
author="Clark, Barry A. J. and Berggren, L.",
volume="49",
number="5",
pages="673-678",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-639X",
doi="",
url="http://dx.doi.org/"
}