@article{ref1,
title="Hearing loss in boxers and pneumatization of the mastoid bones",
journal="Otolaryngologia polska",
year="1968",
author="Betkowski, A.",
volume="22",
number="2",
pages="299-300",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0030-6657",
doi="",
url="http://dx.doi.org/"
}