@misc{indiciaee5e5a9fb5e18,
  title = {Metallicity Gradients in Elliptical Galaxies},
  author = {Hanlan, Patricia C. and Schombert, James M. and Barsony, Mary and Rakos, Karl D.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/20060038772},
  note = {Source identifier: 20060038772}
}