MathSciDoc: An Archive for Mathematician ∫

@inproceedings{lars1966real,
  title={Real algebras with a Hilbert space structure},
  author={Lars Ingelstam},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203436551597061},
  booktitle={Arkiv for Matematik},
  volume={6},
  number={4},
  pages={459-465},
  year={1966},
}