@article{ref1,
title="Mental work-load as a function of demand, capacity, strategy and skill",
journal="Ergonomics",
year="1978",
author="Welford, A. T.",
volume="21",
number="3",
pages="151-167",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}