@inproceedings{f.1954rearrangements,
title={Rearrangements of$C$_{1}-summable series},
author={F. Bagemihl, and P. Erdös},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203140832325801},
booktitle={Acta Mathematica},
volume={92},
number={1},
pages={35-53},
year={1954},
}