@misc{indiciaea17b83fe4c91,
  title = {Dense Clouds near the Central Engine of Active Galactic Nuclei},
  author = {Sivron, R. and Tsuruta, S},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19980201311},
  note = {Source identifier: 19980201311}
}