@misc{indiciaec16ccb2729ba,
  title = {A comparison between families obtained from different proper elements},
  author = {Zappala, Vincenzo and Cellino, Alberto and Farinella, Paolo},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930010081},
  note = {Source identifier: 19930010081}
}