@misc{indiciae333557378291,
  title = {Real time microprocessor-based 50 Hz notch filter for ECG.},
  author = {T T Choy and P M Leung},
  year = {1988},
  doi = {10.1016/0141-5425(88)90013-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/3392981/},
  note = {Source identifier: 3392981}
}