@inproceedings{a.1935über,
title={Über die$W$-Kurven im dreidimensionalen Raume},
author={A. Wiman},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203106331222543},
booktitle={Acta Mathematica},
volume={64},
number={1},
pages={243-352},
year={1935},
}