@misc{indiciaeb39f86da82d0,
  title = {Contingent negative variation in headache.},
  author = {A Maertens de Noordhout and M Timsit-Berthier and M Timsit and J Schoenen},
  year = {1986},
  doi = {10.1002/ana.410190115},
  url = {https://pubmed.ncbi.nlm.nih.gov/3947039/},
  note = {Source identifier: 3947039}
}