King, 1974, J. Soc. Dyers Colourists, 90, 281, 10.1111/j.1478-4408.1974.tb03206.x
Ibrahim, 1985, Colour difference analysis of lightfastness for some direct dyes, Polym. Photochem., 6, 85, 10.1016/0144-2880(85)90016-8
Simon, 1957, J. Opt. Soc. Amer., 47, 1050
Davidson, 1951, J. Opt. Soc. Amer., 41, 1052, 10.1364/JOSA.41.001052
Brockes, 1958, Die Farbe, 7, 257
Warburton, 1958, Die Farbe, 7, 247
Williams, 1958, Die Farbe, 7, 209
Trotman, 1964, Dyeing and chemical technology of textile fibres, 441
1962
Judd, 1975