@inproceedings{ronald1974a,
title={A maximum principle with applications to subharmonic functions in$n$-space},
author={Ronald Gariepy, and John Lewis},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203454594174215},
booktitle={Arkiv for Matematik},
volume={12},
number={1},
pages={253-266},
year={1974},
}
Ronald Gariepy, and John Lewis. A maximum principle with applications to subharmonic functions in$n$-space. 1974. Vol. 12. In Arkiv for Matematik. pp.253-266. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203454594174215.