@inproceedings{peter1998fundamental,
title={Fundamental solutions of real homogeneous cubic operators of principal type in three dimensions},
author={Peter Wagner},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203333804221579},
booktitle={Acta Mathematica},
volume={182},
number={2},
pages={283-300},
year={1998},
}
Peter Wagner. Fundamental solutions of real homogeneous cubic operators of principal type in three dimensions. 1998. Vol. 182. In Acta Mathematica. pp.283-300. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203333804221579.