@misc{indiciae88915144b280,
  title = {Padding point extrapolation techniques for the Butterworth digital filter.},
  author = {G Smith},
  year = {1989},
  doi = {10.1016/0021-9290(89)90082-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/2613731/},
  note = {Source identifier: 2613731}
}