@misc{indiciae9c19d5050bff,
  title = {Fetal EEG sleep stages and physiologic variability.},
  author = {L I Mann and S Duchin and R R Weiss},
  year = {1974},
  doi = {10.1016/0002-9378(74)90215-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/4842593/},
  note = {Source identifier: 4842593}
}