@misc{indiciae619a23785d3d,
  title = {Fixed coupling: different mechanisms revealed by exercise-induced changes in cycle length.},
  author = {E L Michelson and J Morganroth and J F Spear and J A Kastor and M E Josephson},
  year = {1978},
  doi = {10.1161/01.cir.58.6.1002},
  url = {https://pubmed.ncbi.nlm.nih.gov/709757/},
  note = {Source identifier: 709757}
}