@article{ref1,
title="Visual monitoring in a simulated agricultural machinery operation",
journal="Human factors",
year="1981",
author="Gunkel, W. W. and Rehkugler, G. E. and Kaminaka, M. S.",
volume="23",
number="2",
pages="165-173",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}