@article{ref1,
title="A preliminary theory of the effects of task and environmental factors on human performance",
journal="Human factors",
year="1971",
author="Teichner, W. H. and Olson, David E.",
volume="13",
number="4",
pages="295-344",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}