@article{ref1,
title="An evaluation of the effect of selected combinations of target and background coding on map-reading performance: Experiment V",
journal="Human factors",
year="1961",
author="Christner, CA and Ray, HW",
volume="3",
number="2",
pages="131-146",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}