@misc{indiciaecdb3d6d1836f,
  title = {Interstellar and intergalactic absorption of cosmic X rays.},
  author = {Felten, J. E. and Gould, R. J.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660059368},
  note = {Source identifier: 19660059368}
}