@inproceedings{piermarco2016on,
title={On the topology of the set of singularities of a solution of the Hamilton-Jacobi equation},
author={Piermarco Cannarsa, Wei Cheng, and Albert Fathi},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170124223310554087119},
year={2016},
}

Piermarco Cannarsa, Wei Cheng, and Albert Fathi. On the topology of the set of singularities of a solution of the Hamilton-Jacobi equation. 2016. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170124223310554087119.