@inproceedings{ta1934die,
title={Die Stabilitätsfrage bei Differenzengleichungen},
author={Ta Li},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203105270965535},
booktitle={Acta Mathematica},
volume={63},
number={1},
pages={99-141},
year={1934},
}