@inproceedings{anders1987an,
title={An extended Euler-Poincaré theorem},
author={Anders Björner, and Gil Kalai},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203311668120425},
booktitle={Acta Mathematica},
volume={161},
number={1},
pages={279-303},
year={1987},
}