@misc{indiciae5a503a33038a,
  title = {Ultradian rhythms in extended performance.},
  author = {W C Orr and H J Hoffman and F W Hegge},
  year = {1974},
  url = {https://pubmed.ncbi.nlm.nih.gov/4416768/},
  note = {Source identifier: 4416768}
}