@misc{indiciae8ea0662b2526,
  title = {Second Note on a Metagalactic Density Gradient.},
  author = {H Shapley},
  year = {1938},
  doi = {10.1073/pnas.24.12.527},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577851/},
  note = {Source identifier: 16577851}
}