@misc{indiciaefbb1c1e5dcb8,
  title = {Elemental technetium and promethium as cosmic-ray clocks},
  author = {Drach, J. and Salamon, M. H.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19870062574},
  note = {Source identifier: 19870062574}
}