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WikiPedia: OpenGL http://www.cgw.com/Publications/CGW/2012/Volume-35... http://www.lextrait.com/Vincent/implementations.ht... http://www.sgi.com/products/software/opengl/licens... http://www.sgi.com/products/software/opengl/overvi... http://www.opengl.org https://archive.is/20120530/http://www.lextrait.co... https://web.archive.org/web/20041031094901/http://... https://web.archive.org/web/20121101073722/http://... https://www.khronos.org/registry/OpenGL/specs/gl/g... https://opengl.org