Colour vision deficiencies VI proceedings of the Sixth Symposium of the International Research Group on Colour Vision Deficiencies held at the Klinikum der Freien Universitat, (West) Berlin-Steglitz, 17-19 September 1981 - International Research Group on Colour Vision Deficiencies. Symposium (6th : 1981 : Klinikum der Freien Universitat, Berlin, Germany); Verriest, G. (Guy); International Research Group on Colour Vision Deficiencies (The Hague : W. Junk, 1982)
Keywords: Color blindness -- Congresses; Color perception tests -- congresses