@misc{indiciae6dd09fe16a8d,
  title = {Dark grains in comet Crommelin},
  author = {Hanner, M. S. and Sekanina, Z. and Knacke, R. and Tokunaga, A. T.},
  year = {1985},
  url = {https://ntrs.nasa.gov/citations/19860035442},
  note = {Source identifier: 19860035442}
}