@misc{indiciae237632a5e5a6,
  title = {Comfortable effort level: an experimental variable.},
  author = {W S Brown and T Murry and D Hughes},
  year = {1976},
  doi = {10.1121/1.381141},
  url = {https://pubmed.ncbi.nlm.nih.gov/977833/},
  note = {Source identifier: 977833}
}