@misc{indiciaefa1ba261dde6,
  title = {Frequency dependence in the "pain system".},
  author = {D E Richards and J S Brodkey and F E Nulsen},
  year = {1972},
  url = {https://pubmed.ncbi.nlm.nih.gov/4671142/},
  note = {Source identifier: 4671142}
}