@misc{indiciae8826e6610674,
  title = {A special spatial frequency analyzer.},
  author = {W L Brigner},
  year = {1977},
  doi = {10.1016/0042-6989(77)90163-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/595391/},
  note = {Source identifier: 595391}
}