@inproceedings{fulton1987bi-invariant,
title={Bi-invariant differential operators on the Euclidean motion group and applications to generalized Radon transforms},
author={Fulton B. Gonzalez},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203527219633488},
booktitle={Arkiv for Matematik},
volume={26},
number={1},
pages={191-204},
year={1987},
}
Fulton B. Gonzalez. Bi-invariant differential operators on the Euclidean motion group and applications to generalized Radon transforms. 1987. Vol. 26. In Arkiv for Matematik. pp.191-204. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203527219633488.