@inproceedings{bob2000fixed,
title={Fixed point free actions on$Z$-acyclic 2-complexes},
author={Bob Oliver, and Yoav Segev},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203341300844631},
booktitle={Acta Mathematica},
volume={189},
number={2},
pages={203-285},
year={2000},
}