@misc{indiciaea318b8dcf085,
  title = {Extraterrestrial intelligence - An observational approach},
  author = {Murray, B. and Gulkis, S. and Edelson, R. E.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780038615},
  note = {Source identifier: 19780038615}
}