@misc{indiciae85ecc658cb83,
  title = {Cosmic Rays from Super-Novae.},
  author = {W Baade and F Zwicky},
  year = {1934},
  doi = {10.1073/pnas.20.5.259},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587882/},
  note = {Source identifier: 16587882}
}