@article{ref1,
title="Human body nonlinearity and mechanical impedance analyses",
journal="Journal of biomechanics",
year="1969",
author="Wittmann, T. J. and Phillips, N. S.",
volume="2",
number="3",
pages="281-288",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9290",
doi="",
url="http://dx.doi.org/"
}