**3. Caton R: The electric currents of the brain. Br Med J 2:278, 1875
4. Epstein CM, Brickley GP: Interelectrode distance and amplitude of the scalp EEG. Electroencephalogr Clin Neurophysiol 60:287-292, 1985
5. Green RM, Messick WJ, Ricotta JJ, Charlton MH, Satran R, McBride MM, DeWeese JA: Benefits, shortcomings, and costs of EEG monitoring. Ann Surg 201:785-92, 1985
6. Homan RW, Herman J, Purdy P: Cerebral location of international 10-20 system electrode placement. Electroencephalogr Clin Neurophysiol 66:376-82, 1987
7. Jasper HH: The Ten-Twenty electrode system of the international federation. Electroencephalogr Clin Neurophysiol 10:371-375, 1958
**9. Martin JH: The collective electrical behavior of cortical neurons: The electroencephalogram and the mechanisms of epilepsy, Principles of neural science, 3rd Ed. Edited by E. R. Kandel, J. H. Schwartz and T. M. Jessell. New York, Elsevier, 1991, pp 777-791
*10. Niedermeyer E, Lopes da Silva F(eds): Electroencephalography: Basic Principles, Clinical Applications, and Related Fields, 3rd Ed. Baltimore, Williams&Williams, 1993
*11. Nunez PL: Electric fields of the Brain: The neurophysics of EEG, New York, Oxford, 1981
13. Schulte am Esch J, Kochs E(eds): Central nervous system monitoring in anesthesia and intensive care. Berlin, Springer-Verlag, 1994