@inproceedings{henry1935the,
title={The measurable boundaries of an arbitrary function},
author={Henry Blumberg},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203106995565548},
booktitle={Acta Mathematica},
volume={65},
number={1},
pages={263-282},
year={1935},
}