@inproceedings{jean-louis1999kelvin,
title={Kelvin transform and multi-harmonic polynomials},
author={Jean-Louis Clerc},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203336404395598},
booktitle={Acta Mathematica},
volume={185},
number={1},
pages={81-99},
year={1999},
}