@misc{indiciaec20500d3121f,
  title = {Shells in the C2 coma of Comet P/Halley},
  author = {Schulz, Rita and A'Hearn, Michael F.},
  year = {1995},
  url = {https://ntrs.nasa.gov/citations/19950060242},
  note = {Source identifier: 19950060242}
}