@misc{indiciaeeaa355b67020,
  title = {High frequency oscillators with adjustable waveforms: practical aspects.},
  author = {L Freitag and M Schroer and J Bremme},
  year = {1989},
  doi = {10.1093/bja/63.7.38},
  url = {https://pubmed.ncbi.nlm.nih.gov/2692681/},
  note = {Source identifier: 2692681}
}