@misc{indiciaefa2010cc9e68,
  title = {Estimation of running frequency spectra using a Kalman filter algorithm.},
  author = {D W Skagen},
  year = {1988},
  doi = {10.1016/0141-5425(88)90011-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/3392979/},
  note = {Source identifier: 3392979}
}