@article{ref1,
title="Improving visual performance through volitional focus control",
journal="Human factors",
year="1987",
author="Couchman, Donald H. and Roscoe, Stanley N.",
volume="29",
number="3",
pages="311-325",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}