@misc{indiciae71f795ac6f18,
  title = {DONAR: a computer processing system to extend ultrasonic pulse-echo testing.},
  author = {S Lees and F B Gerhard and F E Barber and S P Cheney},
  year = {1973},
  doi = {10.1016/0041-624x(73)90201-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/4720644/},
  note = {Source identifier: 4720644}
}