@misc{indiciaefd48687b8bb8,
  title = {Positron annihilation processes update},
  author = {Guessoum, Nidhal and Skibo, Jeffrey G. and Ramaty, Reuven},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/19970025744},
  note = {Source identifier: 19970025744}
}