@misc{indiciaecb6fe09459d1,
  title = {Quasi-stellar objects - A progress report.},
  author = {Burbidge, E. M. and Burbidge, G. R.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700034225},
  note = {Source identifier: 19700034225}
}