@misc{indiciae2b44c35b2d8a,
  title = {A Metagalactic Density Gradient.},
  author = {H Shapley},
  year = {1938},
  doi = {10.1073/pnas.24.7.282},
  url = {https://pubmed.ncbi.nlm.nih.gov/16577846/},
  note = {Source identifier: 16577846}
}