@inproceedings{wilbert1970the,
title={The ideal center of partially ordered vector spaces},
author={Wilbert Wils},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203223040150117},
booktitle={Acta Mathematica},
volume={127},
number={1},
pages={41-77},
year={1970},
}