MathSciDoc: An Archive for Mathematician ∫

@inproceedings{john1971extremal,
  title={Extremal Analytic Functions in the Unit Circle},
  author={John L. Lewis},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203449458121171},
  booktitle={Arkiv for Matematik},
  volume={10},
  number={1},
  pages={173-194},
  year={1971},
}