MathSciDoc: An Archive for Mathematician ∫

@inproceedings{edgar1958a,
  title={A non-closed relative spectrum},
  author={Edgar Asplund},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203422335671939},
  booktitle={Arkiv for Matematik},
  volume={3},
  number={5},
  pages={425-427},
  year={1958},
}