1. ITU-T Recommendation P.800: Methods for subjective determination of transmission quality (1996)
2. Ebem, D.U., et al.: The impact of tone language and non-native language listening on measuring speech quality. J. Audio Eng. Soc. 59(9), 647–655 (2011)
3. ITU-T Recommendation P.862: Perceptual evaluation of speech quality (PESQ), an ojective method for end-to-end speech quality assessment of narrowband telephone networks and speech codecs (2001)
4. ITU-T Recommendation P.800.1: Mean Opinion Score Terminology (2006)
5. ITU-T Recommendation G.107: The E-model: a computational model for use in transmission planning (2015)