@article{ref1,
title="The outdoor mobility of elderly people--a comparative study in three European countries",
journal="Studies in health technology and informatics",
year="1998",
author="Mollenkopf, H. and Marcellini, F. and Ruoppila, I.",
volume="48",
number="",
pages="204-211",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0926-9630",
doi="",
url="http://dx.doi.org/"
}