@inproceedings{j.1949the,
title={The principle of the excluded third and the Bolzano-Weierstrass lemma},
author={J. Billing},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203409470772837},
booktitle={Arkiv for Matematik},
volume={1},
number={1},
pages={59-59},
year={1949},
}