TY  - RPRT
TI  - Brain potentials during mental arithmetic-effects of problem difficulty on event-related brain potentials.
AU  - J Kong
AU  - Y Wang
AU  - H Shang
AU  - X Yang
AU  - D Zhuang
PY  - 1999
DO  - 10.1016/s0304-3940(98)00974-4
UR  - https://pubmed.ncbi.nlm.nih.gov/10076894/
ID  - 10076894
ER  -