@article{ref1,
title="Cause of stair and flat surface falls. Possibilities for prevention",
journal="Lebensversicherungs Medizin",
year="1983",
author="Hein, P. M. and Schulz, E.",
volume="35",
number="7",
pages="154-156",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0024-0044",
doi="",
url="http://dx.doi.org/"
}