@misc{indiciaee3b49d5307be,
  title = {Neutron-gamma techniques for planetary exploration},
  author = {Johnson, R. G. and Evans, L. G. and Trombka, J. I.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790045548},
  note = {Source identifier: 19790045548}
}