MathSciDoc: An Archive for Mathematician ∫

@inproceedings{alexander1983balls,
  title={Balls and metrics defined by vector fields I: Basic properties},
  author={Alexander Nagel, Elias M. Stein, and Stephen Wainger},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203304712641374},
  booktitle={Acta Mathematica},
  volume={155},
  number={1},
  pages={103-147},
  year={1983},
}