@misc{indiciaec8b4a39adcc9,
  title = {Spectral evolution of active galactic nuclei Penrose Compton scattering processes and gamma ray emission from Seyfert galaxies},
  author = {Leiter, Darryl and Boldt, Elihu},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900014001},
  note = {Source identifier: 19900014001}
}