@misc{indiciaec709d13220e1,
  title = {Physical associations between quasi-stellar objects and galaxies.},
  author = {Burbidge, G. R. and O'Dell, S. L. and Strittmatter, P. A.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720053561},
  note = {Source identifier: 19720053561}
}