1. N.S. Jayant, P. Noll, Digital Coding of Waveforms. (Prentice-Hall, 1984)
2. J.C. Bellamy, Digital Telephony. (Wiley, 2000)
3. T.E. Tremain, The government standard linear predictive coding algorithm: LPC-10, in Speech Technology (1982)
4. J.P. Campbell, Jr., T.E. Tremain, V.C. Welch, The DOD 4.8 kbps standard (Proposed Federal Standard 1016), in Advances in Speech Coding. (Kluwer Academic Publishers, 1991)
5. Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s. ITU-T Recommendation G.723.1 (1996)