raytracing - Ray tracing glossy reflection: sampling ray direction - Stack Overflow
brdf - What is the difference between glossy and specular reflection? - Computer Graphics Stack Exchange
Quantification and prediction of visually perceived specular gloss at three illumination/viewing geometries | Journal of Coatings Technology and Research
ASTM D523 is a standard test method for specular gloss - Micom
Specular Gloss
The specular gloss at 60° of the materials with different concentration... | Download Scientific Diagram
Convert specular/gloss maps to metallic/roughness maps for Cycles? - Materials and Textures - Blender Artists Community