@misc{indiciaecfd43e015034,
  title = {Laboratory evidence for ionized polycyclic aromatic hydrocarbons in the interstellar medium},
  author = {Szczepanski, Jan and Vala, Martin},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930063355},
  note = {Source identifier: 19930063355}
}