@inproceedings{elias1959on,
title={On the theory of harmonic functions of several variables},
author={Elias M. Stein, and Guido Weiss},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203153734749898},
booktitle={Acta Mathematica},
volume={103},
number={1},
pages={25-62},
year={1959},
}
Elias M. Stein, and Guido Weiss. On the theory of harmonic functions of several variables. 1959. Vol. 103. In Acta Mathematica. pp.25-62. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203153734749898.