@article{ref1,
title="Visual surveillance and reconnaissance from space vehicles",
journal="Human factors",
year="1963",
author="Narva, M. A. and Muckler, F. A.",
volume="5",
number="",
pages="295-315",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}