@inproceedings{bo1951on,
title={On the growth of minimal positive harmonic functions in a plane region},
author={Bo Kjellberg},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203412167194856},
booktitle={Arkiv for Matematik},
volume={1},
number={4},
pages={347-351},
year={1951},
}
Bo Kjellberg. On the growth of minimal positive harmonic functions in a plane region. 1951. Vol. 1. In Arkiv for Matematik. pp.347-351. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203412167194856.