@misc{indiciae8754c7469431,
  title = {Spontaneous variation in systolic time interval.},
  author = {M Fromer and E A Raeder and R Amrein and D Burckhardt},
  year = {1979},
  doi = {10.1016/s0140-6736(79)92938-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/85047/},
  note = {Source identifier: 85047}
}