@misc{indiciae95452e5fbf74,
  title = {Spontaneous rhythms in physiological control systems.},
  author = {B W Hyndman and R I Kitney and B M Sayers},
  year = {1971},
  doi = {10.1038/233339a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/4940430/},
  note = {Source identifier: 4940430}
}