@inproceedings{åke1968on,
title={On radial zeros of Blaschke products},
author={Åke Samuelsson},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203441156194100},
booktitle={Arkiv for Matematik},
volume={7},
number={5},
pages={477-494},
year={1968},
}