@misc{indiciae0b39526b30ee,
  title = {On Normal Operators.},
  author = {J von Neumann},
  year = {1935},
  doi = {10.1073/pnas.21.6.366},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587983/},
  note = {Source identifier: 16587983}
}