Unity - Manual: Usage and Performance of Built-in Shaders
Cel Shading | Part 1 - Diffuse Lighting
Unable to find shaders used for the terrain engine. - Questions & Answers - Unity Discussions
Sprite Diffuse shader breaks dynamic batching - Unity Forum
Diffuse Pink Shader Issue - Unity Forum
GitHub - Shrimpey/Outlined-Diffuse-Shader-Fixed: This is a fixed version of diffused outline shader from http://wiki.unity3d .com/index.php/Outlined_Diffuse_3