@article{ref1,
title="The Stipple test: a follow-up study",
journal="Aeromedica acta",
year="1957",
author="Van wulfften paalthe, P. M.",
volume="5",
number="",
pages="327-346",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0568-0549",
doi="",
url="http://dx.doi.org/"
}