@article{ref1,
title="Visual fatigue and occupational stress in VDT operators",
journal="Human factors",
year="1981",
author="Dainoff, Marvin J. and Happ, A. and Crane, P.",
volume="23",
number="4",
pages="421-437",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}