@inproceedings{stefaan2010an,
title={An inner amenable group whose von Neumann algebra does not have property Gamma},
author={Stefaan Vaes},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203358532017755},
booktitle={Acta Mathematica},
volume={208},
number={2},
pages={389-394},
year={2010},
}

Stefaan Vaes. An inner amenable group whose von Neumann algebra does not have property Gamma. 2010. Vol. 208. In Acta Mathematica. pp.389-394. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203358532017755.