@misc{indiciaef16fce1a5fc8,
  title = {Heart rate variability.},
  author = {C M van Ravenswaaij-Arts and L A Kollée and J C Hopman and G B Stoelinga and H P van Geijn},
  year = {1993},
  doi = {10.7326/0003-4819-118-6-199303150-00008},
  url = {https://pubmed.ncbi.nlm.nih.gov/8439119/},
  note = {Source identifier: 8439119}
}