@article{ref1,
title="Problems of proof of improvement in follow-up appraisal of accidental injuries",
journal="Zentralblatt fur Chirurgie",
year="1975",
author="Wahl, D.",
volume="100",
number="17",
pages="1064-1069",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0044-409X",
doi="",
url="http://dx.doi.org/"
}