@inproceedings{casper1963remark,
title={Remark on a problem of Lusin},
author={Casper Goffman},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203203285807970},
booktitle={Acta Mathematica},
volume={111},
number={1},
pages={63-72},
year={1963},
}