@article{ref1,
title="Sports injuries in persons over 30 years of age",
journal="Postgraduate medicine",
year="1960",
author="Levinthal, D. H.",
volume="28",
number="",
pages="121-129",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0032-5481",
doi="",
url="http://dx.doi.org/"
}