@misc{indiciae77c160885b39,
  title = {Time and frequency domain methods for heart rate variability analysis: a methodological comparison.},
  author = {D A Litvack and T F Oberlander and L H Carney and J P Saul},
  year = {1995},
  doi = {10.1111/j.1469-8986.1995.tb02101.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/7568644/},
  note = {Source identifier: 7568644}
}