@misc{indiciaecf459e4b17f7,
  title = {Upper Limits of SO AND SO2 in Comets},
  author = {Kim, Sang J. and A'Hearn, Michael F.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19970015348},
  note = {Source identifier: 19970015348}
}