@inproceedings{lennart1962on,
title={On the existence of boundary values for harmonic functions in several variables},
author={Lennart Carleson},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203427350763984},
booktitle={Arkiv for Matematik},
volume={4},
number={5},
pages={393-399},
year={1962},
}
Lennart Carleson. On the existence of boundary values for harmonic functions in several variables. 1962. Vol. 4. In Arkiv for Matematik. pp.393-399. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203427350763984.