@misc{indiciaecd5616bb90db,
  title = {Extra-galactic distance scale.},
  author = {S Van den Bergh},
  year = {1970},
  doi = {10.1038/225503a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/16056584/},
  note = {Source identifier: 16056584}
}