2) N. W. Lewis and J. W. Allnatt : “Subjective Quality of Television Pictures with Multiple Impairments”, Electronic Letters, 1, 7, pp. 187-188 (Sep., 1965)
3) CCIR : “Subjective Quality of Television Pictures in Relation to the Main Impairments of the Analogue Composite Television Signal”, CCIR, XI-1, Report 960, pp. 202-212 (1982)