1. Tasic, J.F., Najim, M., and Ansorge, M.: ‘Intelligent integrated media communication techniques’, (Kluwer Academic Publishers, Boston 2003), p. 3
2. Kondoz, M.: ‘Digital speech’, (Wiley Publisher 1994), p. 135
3. Salami, R.A.: ‘Binary pulse excitation: a novel approach to low complexity CELP coding’, (Kluwer Academic Publishers 1991), p. 145–146
4. ‘Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s’, ITU-T Recommendation G.723.1:, 1996)
5. ‘Digital cellular telecommunications system; half rate speech’, European Telecommunication Standard, 1998 May)