@article{ref1,
title="The aging pilot of commercial airplanes",
journal="Aeromedica acta",
year="1957",
author="Hubach, J. C.",
volume="5",
number="",
pages="197-210",
abstract="<p>[Abstract unavailable]</p><p>Language: nl</p>",
language="nl",
issn="0568-0549",
doi="",
url="http://dx.doi.org/"
}