@misc{indiciae28dcb8aba676,
  title = {A spectral difference between silicates in Comet Halley and interstellar silicates},
  author = {Campins, Humberto and Ryan, Eileen V.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19910005689},
  note = {Source identifier: 19910005689}
}