MathSciDoc: An Archive for Mathematician ∫

@inproceedings{j.1959on,
  title={On small sumsets in an abelian group},
  author={J. H. B. Kemperman},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203153861564899},
  booktitle={Acta Mathematica},
  volume={103},
  number={1},
  pages={63-88},
  year={1959},
}