@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},
}