@misc{indiciaea0c2c3508e33,
  title = {Heart rate variability.},
  author = {M Malik and A J Camm},
  year = {1990},
  doi = {10.1002/clc.4960130811},
  url = {https://pubmed.ncbi.nlm.nih.gov/2204508/},
  note = {Source identifier: 2204508}
}