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\section{References}  Bickford RD. Electroencephalography. In: Adelman G. ed. Encyclopedia of Neuroscience, Birkhauser, Cambridge (USA): 371-373 (1987).  Campbell IG. EEG Recording and Analysis for Sleep Research. Curr Protoc Neurosci. CHAPTER: Unit10.2 (2009).  Bickford RD. Electroencephalography. In: Adelman G. ed. Encyclopedia of Neuroscience, Birkhauser, Cambridge (USA): 371-373 (1987).  Teplan M. Fundamentals Of EEG Measurement. \textit{Measurement Science Review}, 2(2): 1-11 (2002).