@inproceedings{xavier2020stable,
title={Stable solutions to semilinear elliptic equations are smooth up to dimension 9},
author={Xavier Cabré, Alessio Figalli, Xavier Ros-Oton, and Joaquim Serra},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220310102128396778912},
booktitle={Acta Mathematica},
volume={224},
number={2},
pages={187-252},
year={2020},
}

Xavier Cabré, Alessio Figalli, Xavier Ros-Oton, and Joaquim Serra. Stable solutions to semilinear elliptic equations are smooth up to dimension 9. 2020. Vol. 224. In Acta Mathematica. pp.187-252. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220310102128396778912.