1. Davis, H., Osterhammel, P., Weir, C. & Gjerdingen, D., 1972, Slow vertex potentials: Interactions among auditory, tactile, electric and visual stimuli. EEG, 33: 537–545.
2. Huttunen, J., Hari, R. & Vanni, S., 1987, Crossmodal interaction is reflected in vertex potentials but not in evoked magnetic fields. Acta Neurol. Scand., 75: 410–416.
3. Nunez, P., 1981, “Electrical Fields of the Brain”, Oxford Press, New York.