1. Berger H. Electroencephalograph of Man. Arch Psychol 1931; 228: 644.
2. Tyner FS, Knott JR, Mayer WB.. Fundamentals of EEG technology, Volume 2. New York: Raven Press, 1989.
3. Remond A. Handbook of Electroencephalography and Clinical Neurophysiology, Section III. Frequency analysis: Processing of output data. Amsterdam: Elsevier Scientific Publishing Company, 1973: 5A61–6.
4. Smith NT, Demetrescu M. The EEG during high-dose fentanl anesthesia. Anesthesiology 1980; 53; S7.
5. Bovill JG, Sebel PS, Wauqueier A, Rog P. Electroencepha-lographic effects of Sufentanil anaesthesia in man. Br J Anaesth 1982; 54: 45–52.