@misc{indiciaef629395c194b,
  title = {Multi-level study of C3H2: The first interstellar hydrocarbon ring},
  author = {Madden, S. C. and Irvine, W. M. and Matthews, H. E. and Avery, L. W.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19870005687},
  note = {Source identifier: 19870005687}
}