@inproceedings{arthur1951remainders:,
title={Remainders: Functions of several variables},
author={Arthur Sard},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203130832125727},
booktitle={Acta Mathematica},
volume={84},
number={1},
pages={319-346},
year={1951},
}