@misc{indiciaede6b0e38b9bc,
  title = {A Singular Dark Marking on the Sky.},
  author = {E E Barnard},
  year = {1915},
  doi = {10.1073/pnas.1.7.394},
  url = {https://pubmed.ncbi.nlm.nih.gov/16576026/},
  note = {Source identifier: 16576026}
}