@article{ref1,
title="The impedance of the human knee",
journal="Journal of biomechanics",
year="1976",
author="Crowninshield, R. and Pope, M. H. and Johnson, R. and Miller, R.",
volume="9",
number="8",
pages="529-535",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9290",
doi="",
url="http://dx.doi.org/"
}