McClellan, S, Gibson, J D, Ephraim, Y,, Fussell, J W, Wilcox, L D, Bush, M.A., Gao, Y, Ramabhadran, B, Picheny, M. "Speech Signal Processing The Electrical Engineering Handbook Ed. Richard C. Dorf Boca Raton: CRc Press llc. 2000McClellan, S., Gibson, J.D., Ephraim, Y., Fussell, J.W., Wilcox, L.D., Bush, M.A., Gao, Y., Ramabhadran, B., Picheny, M. “Speech Signal Processing” The Electrical Engineering Handbook Ed. Richard C. Dorf Boca Raton: CRC Press LLC, 2000