@inproceedings{bernt1971the,
title={The optimal number of faces in cubical complexes},
author={Bernt Lindström},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203445226628137},
booktitle={Arkiv for Matematik},
volume={8},
number={3},
pages={245-257},
year={1971},
}