@misc{indiciae483c740a3b02,
  title = {A Classification of Quadratic Vector Functions.},
  author = {F L Hitchcock},
  year = {1915},
  doi = {10.1073/pnas.1.3.177},
  url = {https://pubmed.ncbi.nlm.nih.gov/16575970/},
  note = {Source identifier: 16575970}
}