@misc{indiciae9f7b5f856055,
  title = {The second filter is real, but how does it work?},
  author = {H Davis},
  year = {1981},
  doi = {10.1016/s0196-0709(81)80034-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/7270803/},
  note = {Source identifier: 7270803}
}