@inproceedings{alberto1999l1,
title={L1 stability estimates for n n conservation laws},
author={Alberto Bressan, Tai-Ping Liu, and Tong Yang},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224210711448085489},
booktitle={Archive for rational mechanics and analysis},
volume={149},
number={1},
pages={1-22},
year={1999},
}

Alberto Bressan, Tai-Ping Liu, and Tong Yang. L1 stability estimates for n n conservation laws. 1999. Vol. 149. In Archive for rational mechanics and analysis. pp.1-22. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224210711448085489.