1. Adoul, J. P., Laflamme, C. (1997). Depth-first algebraic codebook search for fast coding of speech, US Patent US5701392A. December 23.
2. Bernard, A. P. (2005). Algebraic codebook system and Method. US Patent US6847929B2. January 25.
3. Bhatt, N., & Kosta, Y. (2011) Proposed modifications in ETSI GSM 06.10 full rate speech codec and its overall evaluation of performance using MATLAB. International Journal of Speech Technology, 14(3), 157.
4. Falk T. H., & Chan, W. (2006). Single-ended speech quality measurement using machine learning methods. IEEE Transactions on Audio, Speech, and Language Processing, 14(6), 1935–1947
5. Grundlehner, B., Lecocq, J., Balan, R., & Rosca, J. (2005). Performance assessment method for speech enhancement systems. In Proceedings of 1st annual IEEE BENELUX/DSP valley signal processing symposium (pp. 1–4).