@misc{indiciae79ab0fac078e,
  title = {Positron annihilation in the interstellar medium},
  author = {Guessoum, Nidhal and Ramaty, Reuven and Lingenfelter, Richard E.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910065870},
  note = {Source identifier: 19910065870}
}