@article{ref1,
title="Evaluation of decision-tree rating scales for mental workload estimation",
journal="Ergonomics",
year="1986",
author="Skipper, J. H. and Rieger, C. A. and Wierwille, Walter W.",
volume="29",
number="4",
pages="585-599",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}