@article{ref1,
title="Flight orientation trainer--possibilities and planned application in the air force",
journal="Biomedizinische Technik",
year="1997",
author="Pongratz, H. and Scherb, W. H. and Haschke, R. and Brix, B.",
volume="42",
number="Suppl",
pages="347-348",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0013-5585",
doi="",
url="http://dx.doi.org/"
}