@article{ref1,
title="Frequency of sick leave in various types of exercise and athletics",
journal="Lakartidningen",
year="1975",
author="Lindahl, O. and Linwall, L. and Malmgren, S. and Scherman, A.",
volume="72",
number="13",
pages="1334-1336",
abstract="<p>[Abstract unavailable]</p><p>Language: sv</p>",
language="sv",
issn="0023-7205",
doi="",
url="http://dx.doi.org/"
}