@article{ref1,
title="Pneumothorax in relation to flying",
journal="Minerva medica",
year="1969",
author="Quero, M.",
volume="60",
number="100",
pages="511-522",
abstract="<p>[Abstract unavailable]</p><p>Language: it</p>",
language="it",
issn="0026-4806",
doi="",
url="http://dx.doi.org/"
}