@article{ref1,
title="Predicting search performance for multiple targets",
journal="Human factors",
year="1980",
author="Karwan, M. H. and Drury, C. G. and Morawski, T.",
volume="22",
number="6",
pages="707-718",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}