@misc{indiciae8aba3e13909e,
  title = {The "up-down" problem for operator algebras.},
  author = {G K Pedersen},
  year = {1971},
  doi = {10.1073/pnas.68.8.1896},
  url = {https://pubmed.ncbi.nlm.nih.gov/16578714/},
  note = {Source identifier: 16578714}
}