@misc{indiciae84358d0b2f5c,
  title = {Quasars as indicators of galactic ages},
  author = {Cavaliere, A. and Szalay, A. and Vagnetti, F.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19870039653},
  note = {Source identifier: 19870039653}
}