@misc{indiciae86d7a39d6f1e,
  title = {LINEAR TRANSFORMATIONS IN HILBERT SPACE. I. GEOMETRICAL ASPECTS.},
  author = {M H Stone},
  year = {1929},
  doi = {10.1073/pnas.15.3.198},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577166/},
  note = {Source identifier: 16577166}
}