@article{ref1,
title="The severity and amount of abdominal injuries in sports is increasing",
journal="Lakartidningen",
year="1981",
author="Bergqvist, D. and Karlsson, G. and Matzsch, T. and Hedelin, H. and Linblad, B.",
volume="78",
number="49",
pages="4446-4447",
abstract="<p>[Abstract unavailable]</p><p>Language: sv</p>",
language="sv",
issn="0023-7205",
doi="",
url="http://dx.doi.org/"
}