@inproceedings{s.1933fastperiodische,
title={Fastperiodische Lösungen der Wellengleichung},
author={S. Bochner},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203104344063527},
booktitle={Acta Mathematica},
volume={62},
number={1},
pages={227-237},
year={1933},
}