@inproceedings{serge2010normal,
title={Normal subgroups in the Cremona group},
author={Serge Cantat, Stéphane Lamy, and Yves de Cornulier},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203400198804766},
booktitle={Acta Mathematica},
volume={210},
number={1},
pages={31-94},
year={2010},
}
Serge Cantat, Stéphane Lamy, and Yves de Cornulier. Normal subgroups in the Cremona group. 2010. Vol. 210. In Acta Mathematica. pp.31-94. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203400198804766.