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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
2011 1
2012 1
2014 1
2021 0
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Model-based estimation of knee stiffness.
Pfeifer S, Vallery H, Hardegger M, Riener R, Perreault EJ. Pfeifer S, et al. IEEE Trans Biomed Eng. 2012 Sep;59(9):2604-12. doi: 10.1109/TBME.2012.2207895. Epub 2012 Jul 11. IEEE Trans Biomed Eng. 2012. PMID: 22801482 Free PMC article.
Model-based estimation of active knee stiffness.
Pfeifer S, Hardegger M, Vallery H, List R, Foresti M, Riener R, Perreault EJ. Pfeifer S, et al. IEEE Int Conf Rehabil Robot. 2011;2011:5975474. doi: 10.1109/ICORR.2011.5975474. IEEE Int Conf Rehabil Robot. 2011. PMID: 22275672 Free PMC article.
Knee stiffness estimation in physiological gait.
Pfeifer S, Riener R, Vallery H. Pfeifer S, et al. Annu Int Conf IEEE Eng Med Biol Soc. 2014;2014:1607-10. doi: 10.1109/EMBC.2014.6943912. Annu Int Conf IEEE Eng Med Biol Soc. 2014. PMID: 25570280