Electroencephalographic foci: conditions for their localization.

@article{Helmchen1967ElectroencephalographicFC,
  title={Electroencephalographic foci: conditions for their localization.},
  author={Hanfried Helmchen and Siegfried Kanowski and Hartwig Kunkel},
  journal={Electroencephalography and clinical neurophysiology},
  year={1967},
  volume={23 4},
  pages={385-6}
}