@misc{indiciae9a1671ae6bb6,
  title = {Wavelet packet transform for R-R interval variability.},
  author = {Kunihiko Tanaka and Alan R Hargens},
  year = {2004},
  doi = {10.1016/j.medengphy.2004.01.007},
  url = {https://pubmed.ncbi.nlm.nih.gov/15121056/},
  note = {Source identifier: 15121056}
}