@misc{indiciae80aa21dc9193,
  title = {A differentiator for low-frequency signals.},
  author = {J Nolte},
  year = {1978},
  doi = {10.1109/tbme.1978.326291},
  url = {https://pubmed.ncbi.nlm.nih.gov/311331/},
  note = {Source identifier: 311331}
}