@inproceedings{folke1951eine,
title={Eine neue Art monotoner Kettenbruchentwicklungen},
author={Folke Ryde},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203411956206854},
booktitle={Arkiv for Matematik},
volume={1},
number={4},
pages={319-339},
year={1951},
}