@inproceedings{sergiu2010on,
title={On the formation of trapped surfaces},
author={Sergiu Klainerman, and Igor Rodnianski},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203358308588753},
booktitle={Acta Mathematica},
volume={208},
number={2},
pages={211-333},
year={2010},
}

Sergiu Klainerman, and Igor Rodnianski. On the formation of trapped surfaces. 2010. Vol. 208. In Acta Mathematica. pp.211-333. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203358308588753.