@article{ref1,
title="Symptoms of fatigue in aircraft pilots",
journal="Folia Clínica Internacional (Barc)",
year="1967",
author="Wissfeld, H. J.",
volume="17",
number="10",
pages="501-502",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0015-5527",
doi="",
url="http://dx.doi.org/"
}