https://iwantthatcake.wordpress.com/2012/02/22/real-time-radiosity-geometrics-enlighten/

http://www.geomerics.com/wp-content/uploads/2014/03/londongraphics2011.pdf

http://www.dsogaming.com/interviews/crytek-dx12-vulkan-async-compute-global-illumination-ray-tracing-physically-based-rendering-e3-demos/

http://www.dsogaming.com/interviews/unity-technologies-on-dx12-vulkan-ray-tracing-physically-based-rendering-dynamic-lod-e3-demos-more/