@article{ref1,
title="Visual perception in approach and landing accidents--an epidemiological approach to aviation safety",
journal="South African medical journal SAMJ",
year="1977",
author="Riordan, R. H.",
volume="52",
number="4",
pages="155-155",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0038-2469",
doi="",
url="http://dx.doi.org/"
}