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2. A. Beck, “Die Bestimmung der Localisation der Gehirn-und Rückenmarkfunctionen vermittelst der electrischen Ersheinungen,” Centralblatt für Physiologie, Vol. 4, 1890, pp. 473–476 (cited in [Brazier 61, p. 49]).
3. T.E. Bray, “An Optoelectronic-Magnetic Neuron Component,” Proceedings of the National Electronics Conference, Chicago, IL, Vol. 17, October 1961, pp. 322–326.
4. M.A.B. Brazier, “A History of the Electrical Activity of the Brain — The First Half-Century,” Pitman Medical Publishing Co„ Ltd., London, 1961.
5. R. Caton, “The Electric Currents of the Brain,”British Medical JournalVol. 2, 1875, p. 278 (cited in [Brazier 61, p. 25])