@misc{indiciae532d64b88181,
  title = {Active galactic nuclei with ultrasoft X-ray emission},
  author = {Cordova, F. A. and Kartje, J. F. and Thompson, R. J., Jr. and Mason, K. O. and Puchnarewicz, E. M. and Harnden, F. R., Jr.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19920066721},
  note = {Source identifier: 19920066721}
}