@misc{indiciaebd8d956dc714,
  title = {Brain potentials during mental arithmetic-effects of problem difficulty on event-related brain potentials.},
  author = {J Kong and Y Wang and H Shang and X Yang and D Zhuang},
  year = {1999},
  doi = {10.1016/s0304-3940(98)00974-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/10076894/},
  note = {Source identifier: 10076894}
}