@inproceedings{k.1960almost,
title={Almost periodic functions on semigroups},
author={K. Deleeuw, and I. Glicksberg},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203156457181917},
booktitle={Acta Mathematica},
volume={105},
number={1},
pages={99-140},
year={1960},
}