MathSciDoc: An Archive for Mathematician ∫

@inproceedings{j.1916die,
  title={Die Geometrie der Wirklichkeit},
  author={J. Hjelmslev},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203031070294266},
  booktitle={Acta Mathematica},
  volume={40},
  number={1},
  pages={35-66},
  year={1916},
}