@misc{indiciaeaa0186fcc2a3,
  title = {Cortical activity preceding speech.},
  author = {J Ertl and E W Schafer},
  year = {1967},
  doi = {10.1016/0024-3205(67)90050-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/6033035/},
  note = {Source identifier: 6033035}
}