@misc{indiciaeaed3159f05ba,
  title = {Color and population gradients in globular clusters},
  author = {Djorgovski, S. and Piotto, G. and Mallen-Ornelas, G.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19930064712},
  note = {Source identifier: 19930064712}
}