@inproceedings{nikita2011isotropy, title={Isotropy of unitary involutions}, author={Nikita Karpenko, and Maksim Zhykhovich}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203401734265779}, booktitle={Acta Mathematica}, volume={211}, number={2}, pages={227-253}, year={2011}, }