MathSciDoc: An Archive for Mathematician ∫

@inproceedings{a.1933concentrated,
  title={Concentrated and rarified sets of points},
  author={A. S. Besicovitch},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203104580444529},
  booktitle={Acta Mathematica},
  volume={62},
  number={1},
  pages={289-300},
  year={1933},
}