@misc{indiciaede62f7c61833,
  title = {Learning to control heart rate: binary vs analogue feedback.},
  author = {P J Lang and C T Twentyman},
  year = {1974},
  doi = {10.1111/j.1469-8986.1974.tb01127.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4438546/},
  note = {Source identifier: 4438546}
}