@misc{indiciae3af302ea717b,
  title = {A low frequency meter with instantaneous response.},
  author = {L van den Steen},
  year = {1979},
  doi = {10.1109/tbme.1979.326471},
  url = {https://pubmed.ncbi.nlm.nih.gov/521024/},
  note = {Source identifier: 521024}
}