TY  - RPRT
TI  - Contingent negative variation: methods and potential interest in headache.
AU  - J Schoenen
AU  - M Timsit-Berthier
PY  - 1993
DO  - 10.1046/j.1468-2982.1993.1301028.x
UR  - https://pubmed.ncbi.nlm.nih.gov/8448784/
ID  - 8448784
ER  -