@article{ref1,
title="Analysis of visual search activity in skilled and novice helicopter pilots",
journal="Aerospace medicine",
year="1970",
author="Stern, J. A. and Bynum, J. A.",
volume="41",
number="3",
pages="300-305",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}