@inproceedings{harald1929grenzperiodische,
title={Grenzperiodische Funktionen},
author={Harald Bohr},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203050346321421},
booktitle={Acta Mathematica},
volume={52},
number={1},
pages={127-133},
year={1929},
}