1. N. Johannesson, “The ETSI Computation Model: A Tool for Transmission Planning of Telephone Networks,” IEEE Commun. Mag., vol. 35, pp. 70–79, Jan. 1997.
2. ITU-T Recommendation G.107, “The E-Model, A Computational Model for Use in Transmission Planning,” Geneva, 2003.
3. S. Möller, Assessment and Prediction of Speech Quality in Telecommunications. Boston: Kluwer Academic, 2000.
4. S. Quackenbush, T. Barnwell III, & M. Clements, Objective Measures of Speech Quality. Englewood Cliffs, NJ: Prentice-Hall, 1988.
5. ITU-T Recommendation P.800, “Methods for Subjective Determination of Transmission Quality,” Geneva, 1996.