@inproceedings{c.1925zur,
title={Zur funktionentheorie},
author={C. Weierstrass},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203039319608334},
booktitle={Acta Mathematica},
volume={45},
number={1},
pages={1-10},
year={1925},
}