@inproceedings{huang,2011an,
title={An FFT based fast Poisson solver on spherical shells},
author={Huang, Yin-Liang, Jian-Guo Liu, and Wang, Wei-Cheng},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170208234019882946339},
booktitle={Communications in Computational Physics},
volume={9},
number={3},
pages={649-667},
year={2011},
}
Huang, Yin-Liang, Jian-Guo Liu, and Wang, Wei-Cheng. An FFT based fast Poisson solver on spherical shells. 2011. Vol. 9. In Communications in Computational Physics. pp.649-667. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170208234019882946339.