MathSciDoc: An Archive for Mathematician ∫

@inproceedings{göran1963a,
  title={A property of bounded normal operators in Hilbert space},
  author={Göran Björck, and Vidar Thomée},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203428811595997},
  booktitle={Arkiv for Matematik},
  volume={4},
  number={6},
  pages={551-555},
  year={1963},
}