@article{ref1,
title="Time for revision of seafarers vision testing?",
journal="International maritime health",
year="2008",
author="Bull, Nils",
volume="59",
number="1-4",
pages="124-131",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="1641-9251",
doi="",
url="http://dx.doi.org/"
}