@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}, }