@article{ref1,
title="Cross country skiing and spontaneous intestinal perforation in patients with hernias",
journal="Helvetica Chirurgica Acta",
year="1976",
author="Fenner, A.",
volume="43",
number="5-6",
pages="565-568",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0018-0181",
doi="",
url="http://dx.doi.org/"
}