@inproceedings{haskell1967on,
title={On the existence of approximate identities in ideals of group algebras},
author={Haskell P. Rosenthal},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203438758207080},
booktitle={Arkiv for Matematik},
volume={7},
number={2},
pages={185-191},
year={1967},
}
Haskell P. Rosenthal. On the existence of approximate identities in ideals of group algebras. 1967. Vol. 7. In Arkiv for Matematik. pp.185-191. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203438758207080.