1. Rabiner (L. R.), Schafer (R. W.), Digital Processing of speech signals,Prentice-Hall, Englewood Cliffs,Nj, 1978.
2. Kleijn (W. B.),Paliwal (K. K.), Speech coding and synthesis, Elsevier ScienceS.v., 1995.
3. Paliwal (K. K.), Atal (B. S.), Efficient vector quantization ofLpc parameters at 24 bit/frame,Ieee Transactions on Speech and Audio Processing,1, no 1, pp. 3–14, January 1993.
4. Itakura (F.), Line spectrum representation of linear predictive coefficients of speech signals,Journal of Acoustical Society of America,57, p. 535, April 1975.
5. Jayant (N. S.), Noll (P.), Digital Coding of Waveforms-Principales and Applications to Speech and Video, Prentice-Hall.Inc. englewood Cliffs,Nj, 1984.