@inproceedings{sidney1968potential,
title={Potential theory of random walks on Abelian groups},
author={Sidney C. Port, and Charles J. Stone},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203216343627068},
booktitle={Acta Mathematica},
volume={122},
number={1},
pages={19-114},
year={1968},
}
Sidney C. Port, and Charles J. Stone. Potential theory of random walks on Abelian groups. 1968. Vol. 122. In Acta Mathematica. pp.19-114. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203216343627068.