@article{ref1,
title="Biomechanics of internal derangement of the knee. Pathomechanics as determined by analysis of the instant centers of motion",
journal="Journal of bone and joint surgery: American volume",
year="1971",
author="Frankel, V. H. and Burstein, A. H. and Brooks, D. B.",
volume="53",
number="5",
pages="945-962",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-9355",
doi="",
url="http://dx.doi.org/"
}