1. Outlines of a theory of colors in combination;Hård Andrs;Man‐ Environ. Syst,1979
2. Studies of color meaning;Sivik Lars;Man‐Environ. Syst.,1975
3. NCS, a descriptive colour order and scaling system with application for enviromental design;Hård Anders;Man‐Environ. Syst.,1975
4. LarsSivikandAndersHård “Direct Psychometric Scaling of Colour Rendering ” paper presented at the AIC Midterm Symposium on Color Appearance Tokyo August1979.