@inproceedings{s.1935on,
title={On a class of perfect sets},
author={S. Verblunsky},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203107100364549},
booktitle={Acta Mathematica},
volume={65},
number={1},
pages={283-305},
year={1935},
}