1. ITU-T Rec. G.113: Transmission impairments (Geneva 2001)
2. ITU-T Rec. P.11: Effects of transmission impairments (Geneva 1993)
3. ITU-T Rec. P.800: Methods for subjective determination of transmission quality (Geveva 1996)
4. D. Clark: High-resolution subjective testing using a double-blind comparator, J. Audio Eng. Soc. 30, 330-338 (1982)
5. ITU-R Rec. BS.1116-1: Methods for the subjective assessment of small impairments in audio systems including multichannel sound systems (Geneva 1997)