@misc{indiciaeb99d03dea2fc,
  title = {Considerations on the relationship between alpha rhythm and so-called expectancy waves.},
  author = {U Heinemann and H Scheich},
  year = {1969},
  url = {https://pubmed.ncbi.nlm.nih.gov/4188827/},
  note = {Source identifier: 4188827}
}