@misc{indiciaea4d894752210,
  title = {Heart-rate variability (CVT): concurrent validity and test-retest reliability.},
  author = {J A Burdick},
  year = {1968},
  doi = {10.2466/pms.1968.26.3.1001},
  url = {https://pubmed.ncbi.nlm.nih.gov/5657701/},
  note = {Source identifier: 5657701}
}