1. The Measurement of Appearance;Hunter,1972
2. Standard Method of Test for Specular Gloss;ASTM D523,1985
3. Measurement of Specular Gloss of Non-metallic Paint Films at 20°, 60° and 85°,1980
4. The Reflectometer as a Means of Assessing the Specular Gloss of Smooth Painted and Plastic-coated Surfaces;DIN 67530,1982