@inproceedings{georges1931sur,
title={Sur un cditère de dénombrabilité},
author={Georges Durand},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203057121667471},
booktitle={Acta Mathematica},
volume={56},
number={1},
pages={363-369},
year={1931},
}