@inproceedings{s.1928hauptlösungen,
title={Hauptlösungen von Differenzengleichungen},
author={S. Bochner},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203048758454408},
booktitle={Acta Mathematica},
volume={51},
number={1},
pages={1-21},
year={1928},
}