@misc{indiciae4220408ec39b,
  title = {Heart rate variability 1989. An update.},
  author = {D Van Hoogenhuyze and G J Martin and J S Weiss and J Schaad and D Fintel and D H Singer},
  year = {1989},
  doi = {10.1016/s0022-0736(07)80125-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/2614300/},
  note = {Source identifier: 2614300}
}