@inproceedings{renjun2008propagation,
title={Propagation of singularities in the solutions to the Boltzmann equation near equilibrium},
author={Renjun Duan, Meng-Rong Li, and Tong Yang},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224210914634074522},
booktitle={Mathematical Models and Methods in Applied Sciences},
volume={18},
number={7},
pages={1093-1114},
year={2008},
}

Renjun Duan, Meng-Rong Li, and Tong Yang. Propagation of singularities in the solutions to the Boltzmann equation near equilibrium. 2008. Vol. 18. In Mathematical Models and Methods in Applied Sciences. pp.1093-1114. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224210914634074522.