TY  - RPRT
TI  - Brain potentials during mental arithmetic: effects of extensive practice and problem difficulty.
AU  - P Pauli
AU  - W Lutzenberger
AU  - H Rau
AU  - N Birbaumer
AU  - T C Rickard
AU  - R A Yaroush
AU  - L E Bourne
PY  - 1994
DO  - 10.1016/0926-6410(94)90017-5
UR  - https://pubmed.ncbi.nlm.nih.gov/7812175/
ID  - 7812175
ER  -