@article{ref1,
title="The "unhappy triad". Remarks on the mutation of the concept",
journal="MMW: Munchener Medizinische Wochenschrift",
year="1982",
author="Keller, E. and Wentzensen, A. and Weller, S.",
volume="124",
number="41",
pages="887-888",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0341-3098",
doi="",
url="http://dx.doi.org/"
}