@misc{indiciae27230614cb5c,
  title = {On Super-Novae.},
  author = {W Baade and F Zwicky},
  year = {1934},
  doi = {10.1073/pnas.20.5.254},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587881/},
  note = {Source identifier: 16587881}
}