Robert Herzog Vlastimil Havran Shin-ichi Kinuwaki Karol Myszkowski Hans-Peter Seidel Global Illumination using Photon Ray Splatting. 503-513 2007 26 Comput. Graph. Forum 3 http://dx.doi.org/10.1111/j.1467-8659.2007.01073.x db/journals/cgf/cgf26.html#HerzogHKMS07