@article{ref1,
title="Visual detection probability of "sonar" targets as a function of retinal position and brightness contrast",
journal="Human factors",
year="1968",
author="Vallerie, L. L. and Link, J. M.",
volume="10",
number="4",
pages="403-411",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}