@article{ref1,
title="Instability and falls in the elderly",
journal="Age and ageing",
year="1978",
author="Overstall, P. W. and Johnson, A. L. and Exton-Smith, A. N.",
volume="7",
number="Suppl",
pages="92-96",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-0729",
doi="",
url="http://dx.doi.org/"
}