TY  - RPRT
TI  - P300 and anticipated task difficulty.
AU  - P Ullsperger
AU  - U Neumann
AU  - H G Gille
AU  - M Pietschmann
PY  - 1987
DO  - 10.1016/0167-8760(87)90018-3
UR  - https://pubmed.ncbi.nlm.nih.gov/3610730/
ID  - 3610730
ER  -