@misc{indiciae7bd1f15aee1a,
  title = {Improved continuous wave frequency modulated sonars with aural displays.},
  author = {J T Boys and J L Mason and R M Hodgson},
  year = {1978},
  doi = {10.1016/0041-624x(78)90038-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/644683/},
  note = {Source identifier: 644683}
}