@inproceedings{harald1925zur,
title={Zur theorie der fast periodischen funktionen},
author={Harald Bohr},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203039520874336},
booktitle={Acta Mathematica},
volume={45},
number={1},
pages={29-127},
year={1925},
}