@article{ref1,
title="Practice effects on a visual vigilance task with and without search",
journal="Human factors",
year="1970",
author="Edwards, R. S. and Colquhoun, W. P.",
volume="12",
number="6",
pages="537-545",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}