@misc{indiciae99c161640ab7,
  title = {Simplicity with Respect to Certain Quadratic Forms.},
  author = {E T Bell},
  year = {1930},
  doi = {10.1073/pnas.16.2.160},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587541/},
  note = {Source identifier: 16587541}
}