@article{ref1,
title="Tracking performance with visual, auditory, or electrocutaneous displays",
journal="Human factors",
year="1972",
author="Hofmann, M. A. and Heimstra, Norman W.",
volume="14",
number="2",
pages="131-138",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}